Science
Science Practice Test Questions (for when you are ready for the actual test!)
Part I: https://gotestprep.com/ged-science-practice-test/
Part 2: https://gotestprep.com/ged-science-test/
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Science Content (in alphabetical order):
Atoms and Atomic Structure
What is an Atom?
https://www.youtube.com/watch?v=o-3I1JGW-Ck
Basic Atomic Structure – Look Inside an Atom
https://www.youtube.com/watch?v=h6LPAwAmnCQ
Bacteria vs Virus
Introduction to both bacteria and virus. Also includes brief video.
http://www.diffen.com/difference/Bacteria_vs_Virus
Bacteria Game (really about knowing your body parts)-
Balancing Chemical Equations:
A Beginners Guide to Balancing Chemical Equations
https://www.youtube.com/watch?v=gskm-dfKv5g
https://www.youtube.com/watch?v=_B735turDoM
Interactive Practice Balancing Chemical Equations
http://funbasedlearning.com/chemistry/chemBalancer/ques1.htm
http://www.sciencegeek.net/Chemistry/taters/EquationBalancing.htm
http://education.jlab.org/elementbalancing/
Big Bang Theory:
Explained: https://www.space.com/25126-big-bang-theory.html
C-12 Reading and Videos explaining the Big Bang Theory:
https://www.ck12.org/c/earth-science/big-bang/lesson/Big-Bang-MS-ES/?collectionCreatorID=3&conceptCollectionHandle=earth-science-%3A%3A-big-bang&collectionHandle=earth-science
https://edpuzzle.com/video/_7P8QlT3GWk
(this video explains wavelength, spectroscope, doppler, and universe expansion)
https://videos.space.com/m/q0seZKVo/how-to-re-make-the-big-bang?list=9wzCTV4g
(this video re-creates how the big bang may have occurred)
solar system, galaxies - has edpuzzle question/quiz:
https://edpuzzle.com/media/5ec2e89df02e2e3f80272b00
Biogeochemical Cycles
The Cycles of Matter- Overview of all cycles
https://www.youtube.com/watch?v=tJz0QRenVSo
Decomposers - Crash Course Science video that explains how decomposers break down decaying matter and recyle nutrients.
https://www.youtube.com/watch?v=uB61rfeeAsM
The Carbon Cycle - Study Jams video with quiz to check your understanding
http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/carbon-cycle.htm
The Oxygen Cycle-
https://www.youtube.com/watch?v=mUVX5rg1E0I
The Water Cycle (Hydrologic Cycle) - Study Jams video with quiz to check your understanding
http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/water-cycle.htm
The Nitrogen Cycle - Study Jams video with quiz to check your understanding
http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/nitrogen-cycle.htm
The Phosphorus Cycle
https://www.youtube.com/watch?v=_IBx0zpNoEM
Body Systems
Introduction to all systems:
http://www.iheartscience.net/human-body-systems
Introduction to the Skeletal and Muscular Systems:
https://www.youtube.com/watch?v=N2NrZpyEf24
How The Nervous, Endocrine and Reproductive Systems Interact:
https://prezi.com/pno6zzcy-m-w/the-interaction-between-the-reproductive-nervous-and-endoc/
Coordination between the Nervous and Endocrine Systems:
Compare/Contrast: The Endocrine and Nervous
https://www.differencebtw.com/difference-between-nervous-system-and-endocrine-system/
The Circulatory System/The Heart
https://www.youtube.com/watch?v=BEWjOCVEN7M
The Respiratory System
https://www.youtube.com/watch?v=hc1YtXc_84A
The Excretory System
https://www.youtube.com/watch?v=TZMJeZL-BVg
The Digestive System
https://www.youtube.com/watch?v=JnzwbipJuAA
The Endocrine System
https://www.youtube.com/watch?v=wh6e_5bCfnw
The Nervous System
https://www.youtube.com/watch?v=sjyI4CmBOA0
Introduction to the Reproductive System
https://www.youtube.com/watch?v=TxoAt38rcYs
Bioremediation:
https://www.youtube.com/watch?v=Srem6sjemPg
https://www.youtube.com/watch?v=a_HWlFzgQiM
Carbon Cycle:
Global Warming
https://www.youtube.com/watch?v=4_eJdX6y4hM
Cells:
Introductory Video on Plant and Animal Cells (Free School)
https://www.youtube.com/watch?v=3nBtY6LR030
What is a Cell? (Monkey See)
https://www.youtube.com/watch?v=3BZEA4areBM
Learn Genetics, Utah Edu, Interactive animal and plant cells and lots more!
https://learn.genetics.utah.edu/content/cells/
Cell Diffusion and Active Transport
https://www.youtube.com/watch?v=eDeCgTRFCbA
Quizlet Flash Cards to practice the terms associated with learning about cells
https://quizlet.com/316166441/flashcards
Cellular Respiration:
Khan Explains Cellular Respiration:
Overviews:
https://www.youtube.com/watch?v=4Eo7JtRA7lg
5 Minute Intro to Cellular Respiration:
https://www.youtube.com/watch?v=4q-Ge34ME9Y
Intro: Powerpoint
https://slideplayer.com/slide/9025654/
BRIEF but Very Good Intro (Study.com)
https://study.com/academy/lesson/what-is-respiration-definition-process-equation.html
Chemical Reactions
Introduction:
https://www.youtube.com/watch?v=TStjgUmL1RQ
Circulatory System
Learn about the circulatory system in this catching song.
https://www.youtube.com/watch?v=LqhvmUEdOYY
Cladogram
How a Cladogram Works - explained with examples
https://www.youtube.com/watch?v=DmwnvwbXObI
Classification of Animals (mammals, amphibians,...)
Introduction to Classification of Animals and an Interactive Review Activity
http://www.pbslearningmedia.org/asset/lsps07_int_animalclass/
Animal Classification Game
http://www.sheppardsoftware.com/content/animals/kidscorner/games/animalclassgame.htm
DNA
DNA Replication Video
https://www.youtube.com/watch?v=5qSrmeiWsuc&t=4s
Earth's Origins
Introduction to the Big Bang Theory
https://www.youtube.com/watch?v=dMBqa5BdN_8&list=PLISBHwlJXpn0ZHc3t7dpz_pFf2Cnd39y_&index=18
How the Moon was Formed
https://www.youtube.com/watch?v=c0FCE4H0Dro
Origins of Oceans, National Geographic
https://www.youtube.com/watch?v=BvrzM-BavDg
Ecosystems
What is an Ecosystem?
https://www.youtube.com/watch?v=JPHqUxxyLsY
Endothermic and Exothermic Reactions
Introduction: (NOTE: Watch up to the 5:25 mark and then stop. After that it becomes very technical and goes beyond our needs)
https://www.youtube.com/watch?v=0cUK4jcAEaU
Intro #2: https://www.youtube.com/watch?v=L-G7pLufXAo
Overview:
https://www.diffen.com/difference/Endothermic_vs_Exothermic
Endothermic or Exothermic? You Decide!
https://www.youtube.com/watch?v=i3mYWB2fNp4
Demonstration:
https://www.youtube.com/watch?v=NHOHKH3808c
What Triggers a Chemical Reaction? Exothermic and Endothermic Reactions
https://www.youtube.com/watch?v=8m6RtOpqvtU
Electricity
Introduction to Electricity and Electric Currents
https://www.youtube.com/watch?v=D2monVkCkX4
Endothermic vs Exothermic Reactions:
Energy
Introductory video on Potential, Kinetic and Mechanical Energy
Types of Energy Video and Quiz, Study Jams
http://studyjams.scholastic.com/studyjams/jams/science/matter/energy-and-matter.htm
Heat Energy
Heat Transfer: Solids, Liquids and Gas
https://www.youtube.com/watch?v=vuBPgTMKUc0
Heat EnergyTransfer: Conduction
Heat Energy Transfer: Convection
https://www.youtube.com/watch?v=VxGIiOTuAIs
nuclear reactor animation - explains fuel rods, pellets of U 235,238, the importance of water in the reactor:
https://www.youtube.com/watch?v=zyE-PVQh3Wc
Heat Energy Transfer: Radiant or Radiation
https://www.youtube.com/watch?v=5GoZZKcNZiQ
Environmental Issues
Brief Overview: https://slideplayer.com/slide/8970654/
Overview (just hang in with the text-to-speech voice):
https://www.youtube.com/watch?v=A0pB1qw8SMs
Comprehensive Slide-Show Environmental Issues:
Environmental Science
Invasive Species
The affects of introducing new species and organisms to an already existing ecosystem
https://www.youtube.com/watch?v=spTWwqVP_2s
Can Wildlife Adapt to Climate Change? Ted ED video
https://www.youtube.com/watch?v=ZCKRjP_DMII
We’ve Got Ants in our Plants! Awesome video about Ant/Plant Symbiotic relationships!
https://www.youtube.com/watch?v=nqxabifaKJA
Carrying Capacity Introduction
https://www.youtube.com/watch?v=QI2ixJeIxEU
Population Dynamics: Carrying Capacity and Limiting Factors
https://www.youtube.com/watch?v=J1Qe5Ad3ap8
Evolution
The Theory of Evolution
The Theory of Evolution (by Natural Selection) | Cornerstones Education - YouTube
What is the Theory of Evolution?
https://www.youtube.com/watch?v=pQp2lFcDEbw
What Is Evolution?
https://www.youtube.com/watch?v=GhHOjC4oxh8
Charles Darwin – The Theory of Evolution
https://www.youtube.com/watch?v=vnktXHBvE8s
What’s a Fossil
https://www.youtube.com/watch?v=3rkGu0BItKM
Timeline of Human Evolution
https://www.youtube.com/watch?v=hSSzn4bIwZg
Fermentation
Introduction To Fermentation
https://www.youtube.com/watch?v=Og1n44WOyY0
Fermented Foods:
http://www.foodandwine.com/fwx/food/if-it-smells-weird-eat-it-fermented-foods-healthy-gut
Fermentation Interactive:
Force and Motion (each have a video and practice questions)
Force and Motion
http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/force-and-motion.htm
Newton's First Law: Inertia
http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/inertia.htm
Newton's Second Law: Acceleration
http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/acceleration.htm
Newton's Third Law: Action and Reaction
http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/action-and-reaction.htm
Simple Machines
http://studyjams.scholastic.com/studyjams/jams/science/forces-and-motion/simple-machines.htm
Newton's Three Laws - with a bicycle
https://www.youtube.com/watch?v=JGO_zDWmkvk
Real Life Examples of the Three Laws of Motion Video
https://www.youtube.com/watch?v=ztt1mVYH6x4
Newton's 2nd Law: Marble Run Experiment
https://www.youtube.com/watch?v=0hcnQ5xkZ-k
Teacher Tech Interactive Site for Newton’s Laws of Motion
http://teachertech.rice.edu/Participants/louviere/Newton/
Math Formula Practice for the GED Science Test
Five, short videos that walk you through using the some of the math formulas you may see on the GED Science Test. Five Stars!
GED QOD: Utilizing Science Formulas 1 - YouTube
GED QOD: Utilizing Science Formulas 2 - YouTube
GED QOD: Utilizing Science Formulas 3 - YouTube
GED QOD: Utilizing Science Formulas 4 - YouTube
GED QOD: Utilizing Science Formulas 5 - YouTube
Fossil Fuels:
Fossil Fuels 101
Good explanation of how oil, gas and coal are formed, removed from the earth, and utilized as a high-density energy source.
https://www.youtube.com/watch?v=zaXBVYr9Ij0
Oil and Gas Formation
Learn how fossil fuels are formed and how scientists identify where to find fossil fuel resources below the earth.
https://www.youtube.com/watch?v=8YHsxXEVB1M
Will Fossil Fuels Run Out?
https://www.youtube.com/watch?v=jjfs_7kwRks
Bill Nye: Fossil Fuels Video
https://www.youtube.com/watch?v=FbMo3ZsXZv4
The Fracking Process- Pros and Cons
https://www.youtube.com/watch?v=Uti2niW2BRA
Fossil Fuel Quiz
http://science.howstuffworks.com/environmental/energy/fossil-fuel-quiz.htm
Acid Rain
National Geographic video on the cause and effects of acid rain.
https://www.youtube.com/watch?v=1PDjVDIrFec
Genetics:
Introduction (excellent!):
https://www.youtube.com/watch?v=UB6Upeo-HDE
How Gregor Mendel’s Pea Plants Help Us Understand Genetics
https://www.youtube.com/watch?v=Mehz7tCxjSE
How to Draw a Punnett Square - Really Good Explanation with examples
https://www.youtube.com/watch?v=prkHKjfUmMs
Punnett Square Basics - good explanation with examples
https://www.youtube.com/watch?v=PyP_5EgQBmE
Practice Activities for Completing a Punnett Square and Calculating Probabilities
https://www.ixl.com/science/grade-6/complete-and-interpret-punnett-squares
What is an Allele?
https://www.youtube.com/watch?v=FsaYSGWuRmo
National Human Genome Research Institute
What is a chromosome? and tons of other really good information!
https://www.genome.gov/26524120
Homologous Structure vs. Analogous Structure (bone structure - evolution)
https://www.youtube.com/watch?v=Edcz_MzM5qc
Ground Level Ozone
Informative video about the "good" ozone layer and the "bad" ozone
https://www.youtube.com/watch?v=THYoUULn_2U
Global Warming/Greenhouse Effect:
Causes and Effects of Climate Change, National Geographic
https://www.youtube.com/watch?v=G4H1N_yXBiA
NASA Climate Time Machines
Interactive time lapse activities showing how temperatures have increased during our time inhabiting earth. Also, see which coastlines would be covered if the sea levels continue to rise. Valuable visual learning!
https://climate.nasa.gov/interactives/climate-time-machine
The Green House Effect - Global Warming
https://www.youtube.com/watch?v=BPJJM_hCFj0
The Green House Gases and Global Warming (really good explanation)
https://www.youtube.com/watch?v=dw9KO9JsGGk&t=47s
Geology
Introduction to Geology Video:
https://www.youtube.com/watch?v=acwSG17e_lQ
Video: The Earth's Structure, Pangae Theory, Tectonic Plates and More
https://www.learner.org/series/interactive-dynamic-earth/
Gross Science
Variety of videos about many science topics:
Invasive Species
Video: Invasive Species Spreading Across America
https://www.youtube.com/watch?v=mUssO68D2eM
How to Control Invasive Species
https://www.youtube.com/watch?v=ZtEenMeikA4
10 Worst Invasive Species
http://webecoist.momtastic.com/2009/12/15/incoming-the-worlds-10-worst-invasive-species/
Invertebrates:
Introduction:
https://www.youtube.com/watch?v=5E4TsarJk7Y
Law of Conservation of Mass
History of Law of Conservation of a Mass and examples of balancing equations
https://www.youtube.com/watch?v=JCyjLPYXl1I
The Law of Conservation of Matter - Big Bang Theory - TED Ed
https://www.youtube.com/watch?v=2S6e11NBwiw
Magnetism
Introduction to Magnetism (Bill Nye) Part 1
https://www.youtube.com/watch?v=8PyqL9y7VZo
Introduction to Magnetism (Bill Nye) Part 2
https://www.youtube.com/watch?v=_VwvIfmm1OE
Matter
Introduction to Matter: Interactive
http://www.abcya.com/states_of_matter.htm
States of Matter Review Game
https://www.quia.com/rr/38085.html
Matter Slideshow (for lesson):
What Is Matter (for lesson):
https://ged.com/wp-content/uploads/College_admissions_guide.pdf
The Classification of Matter
States of Matter with Videos and Review Questions
States of Matter: Animation
Matter: Just for Fun Video:
https://www.youtube.com/watch?v=yOqm_UzL26w
Post-Questions:
QuiZ:
Mean, Median, Mode and Range in Science:
Introduction to Mean, Median, Mode and Range
http://www.studyzone.org/mtestprep/math8/g/meanmedmodel.cfm
Video Explanation
https://www.youtube.com/watch?v=81zcjULlh58
Interactive Practice
http://www.studyzone.org/mtestprep/math8/g/meanmedmodquiz.cfm
Meiosis and Mitosis: How are they different?
http://www.diffen.com/difference/Meiosis_vs_Mitosis
Meteorology:
Study Jams (Great Science source!)
The Atmosphere: http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/earths-atmosphere.htm
Weather and Climate: http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/weather-and-climate.htm
birth of a tornado:
https://www.youtube.com/watch?v=7KDz6dGQ5RE
The Atmosphere: The 5 layers of the atmosphere are-
https://www.youtube.com/watch?v=CibvtVMTA2E
a meterologist shows weather maps
https://www.youtube.com/watch?v=9NZz-EeveJ8
5 instruments that measure weather:
https://www.youtube.com/watch?v=9NZz-EeveJ8
Molecules and Compounds
Introduction: How to tell the difference
https://www.youtube.com/watch?v=0gsrW0Vb5sw
https://www.youtube.com/watch?v=O0WZKS-Xeb4
Mixtures, Molecules and Compounds
https://www.youtube.com/watch?v=m7nOzfZEem8&t=152s
Compound of Life: Molecules and Compound Interactive
https://dlc.dcccd.edu/biology1-2/molecules-and-compounds
Ionic and Covalent Bonding
https://www.youtube.com/watch?v=OTgpN62ou24
How to Make a Chemical Bond
https://www.thoughtco.com/ionic-and-covalent-chemical-bond-differences-606097
Oceanography:
What Is Oceanography Slide Show
http://www.powershow.com/view/987f0-NTEzM/Earth_Science_Oceanography_powerpoint_ppt_presentation
NASA: The Ocean: A Driving force for weather and climate
http://www.watchknowlearn.org/Video.aspx?VideoID=51383&CategoryID=585
Currents (like roller coasters)
http://education.nationalgeographic.com/education/media/ocean-currents-and-climate/?ar_a=1
Butterfly Effect (interesting and entertaining)
Our Solar System:
How the Solar System was formed-
http://science.howstuffworks.com/33309-space-school-the-solar-system-video.htm
How We Figured Out the Earth Revolves Around the Sun
https://www.youtube.com/watch?v=khIzr6610cQ
Bill Nye demonstrates the distance between the planets-
https://www.youtube.com/watch?v=
How big is our solar system?
https://www.youtube.com/watch?v=_mD-ia6ng0A
Learn more about each planet: Interactive site-
Phases of the Moon
http://www.history.com/shows/the-universe/videos/phases-of-the-moon
Pangaea Puzzle:
http://www.geo.cornell.edu/hawaii/220/PRI/continental_puzzle.html
Parallel and Series Circuits
Introduction:
https://www.youtube.com/watch?v=x2EuYqj_0Uk
Parts of a Plant/Photosynthesis:
Plants and Flowers
Studyjams Video and Quiz
http://studyjams.scholastic.com/studyjams/jams/science/plants/flowers.htm
Gymnosperms (Pinecones!)
Studyjams Video and Quiz
http://studyjams.scholastic.com/studyjams/jams/science/plants/gymnosperms.htm
Photosynthesis
Introduction
http://www.eschooltoday.com/photosynthesis/introduction-to-photosynthesis.
Video - great explanation of photosynthesis
https://www.youtube.com/watch?v=3pD68uxRLkM
Video - photosynthesis chemical equation explained
https://www.youtube.com/watch?v=krju--RliPQ
The Periodic Table of Elements
Solving the Puzzle of the Periodic Table - Ted Ed Video
https://www.youtube.com/watch?v=O-48znAg7VE
Periodic Table - Mendeleev - TedEd Video
https://www.youtube.com/watch?v=fPnwBITSmgU
GED and The Periodic Table
https://magoosh.com/ged/ged-science-periodic-table/
Physics Formulas:
Momentum (Introduction);
https://www.youtube.com/watch?v=Z_k1HeRDZec
Force/Acceleratiom/Momentum Practice
http://highered.mheducation.com/sites/0072509775/student_view0/chapter4/practice_problems.html
Renewable Energy
Biomass Energy
https://www.youtube.com/watch?v=slQRWbRE8VI
Wind Turbines: An Alternative to Fossil Fuels
https://www.youtube.com/watch?v=tsZITSeQFR0
Solar Energy
https://www.youtube.com/watch?v=bhcIJRdyrQg
Hydro Power Energy
https://www.youtube.com/watch?v=kx5rsUnFYmw
*Hydro Power 101 (really good explanation including pros and cons)
https://www.youtube.com/watch?v=kx5rsUnFYmw
Geothermal Energy
https://www.youtube.com/watch?v=D22Z_Ynz4fY
Global map with the location of different energy plants (coal, nuclear, solar, hydro, wind, and lots more!)
http://www.energyjustice.net/map/searchobject.php?gsTable=facility&gsSearchtype=nationalmap
Scientific Method:
Introductory video on the steps involved in the scientific method (really good explanation)
https://www.youtube.com/watch?v=BVfI1wat2y8
Study Jams: Basic Introduction BUT very effective:
http://studyjams.scholastic.com/studyjams/jams/science/scientific-inquiry/scientific-methods.htm
Scientific Method Rap
https://www.youtube.com/watch?v=bUa-ilQqEv0
Scientific Method (Spanish)
Various scientists discuss how they do their work using the scientific method.
http://www.pbslearningmedia.org/resource/ketae.sci.method/the-scientific-method/es/
Khan Academy Scientific Method - Really GOOD Resource! Videos, examples and then quiz yourself!
Scientific Revolution
Overview:
https://www.slideshare.net/gsill/scientific-revolution-lesson-ppt
How to Set Up An Experiment:
Experimental Design in Science: Definition and Method (really good explanation:)
https://www.youtube.com/watch?v=7q8acfBx5to
Experimental Design - Dependent and Independent Variable
https://www.youtube.com/watch?v=FIu5OS-4zZk
Independent Variable, Dependent Variable and Controlled Variables (simple explanation with an example)
https://www.youtube.com/watch?v=0A55QRyJHPM
Quiz Yourself on Identifying the Independent and Dependent Variable in an Experiment (good practice:)
https://www.quia.com/pop/184568.html?AP_rand=2057999204
Experimental Design - Controlled Experiments
https://www.youtube.com/watch?v=VhZyXmgIFAo
Science Resources (Energy/Green Living/Teacher LessonPlan ...)
http://www.ctenergyeducation.com/index.htm
https://ypte.org.uk/lesson-plans
Simple Organisms:
Overview:: Microorganisms
https://www.youtube.com/watch?v=aPmPep2r6uo
Symbiosis:
Introduction-
https://www.youtube.com/watch?v=zTGcS7vJqbs
Examples-
Tale of a bird and pine trees
https://www.youtube.com/watch?v=2AM3ARs9MMg
Amazing Sea Symbiosis
https://www.youtube.com/watch?v=WcQ5_zaJob0
Review and a Quiz
https://www.youtube.com/watch?v=lxPjk-0TbnI
Skeletal and Muscular Systems:
Introduction to the Skeletal System
Introduction to the Muscular System-
Tectonic Plates, Pangaea, Earthquakes and Volcanoes - PBS Learning Videos and Interactive Activities
Be sure to explore the additional videos and activities on this page - awesome videos and a tectonic plate/earthquake/volcano map!
Volcanoes 101 National Geographic Video
Really good video which discusses volcano eruptions and tectonic plates
https://www.youtube.com/watch?v=VNGUdObDoLk
Vertebrates:
Introductory Power-point
https://www.slideshare.net/anaruperez/vertebrates-8764046
Overview of Vertebrates Video:
https://www.youtube.com/watch?v=IT_y1jOoaXc
Animal Classification
http://www.sheppardsoftware.com/content/animals/kidscorner/classification/kc_class_again.htm
Review Game:
http://www.sheppardsoftware.com/content/animals/kidscorner/games/animalclassgame.htm
Koko: The Sign Language Using Gorilla
https://www.youtube.com/watch?v=FqJf1mB5PjQ
Wavelength:
Wave Basics
https://www.youtube.com/watch?v=UMC1EI-2sLo
Demonstration
https://whyy.pbslearningmedia.org/asset/lsps07_int_waves/
Wave on a String: https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html
Transverse and Longitudinal Waves: https://www.youtube.com/watch?v=iT4KAc0Ag1E
Wave Activity (rope) and Wave Machine Demonstration:
http://practicalphysics.org/transverse-waves-along-rope.html
Sound Waves Explained:
https://www.youtube.com/watch?v=-_xZZt99MzY
Introduction to Waves
https://www.youtube.com/watch?v=RVyHkV3wIyk
Slideshow (PPT): https://www.slideshare.net/stanzellasangi/01-introduction-to-waves-17282431
Crash Course Introduction to Waves (Gets a bit technical about about 1/2 way through but is very good)
https://www.youtube.com/watch?v=TfYCnOvNnFU
Light and Colors: Bill Nye the Science guy