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My family at Black Canyon National Park
Welcome to Science!
Welcome to Science!
Good day! I'm excited to have you visit my classroom website. My name is Ryan Osmotherly and most of my students call me Mr. O . I have been teaching Science/Health here at Crawford for 14 years and I have enjoyed it very much. Crawford is my hometown and I never imagined that I would be back here teaching in the same classroom that I once sat in as a student, but here I am, and I'm very thankful to be here.
I have a wonderful family with my wife Michelle and two daughters, Peyton (5th grade) and Kylee (3rd grade). I also get to work with my mom, Mrs. O, and dad, Ozzo, here at the school.
My hobbies include just about anything outdoors. I love to golf, hike, and travel. This past summer we took our family to Orlando, Florida to experience Universal Studios Resorts. We also took a mini vacation to Colorado where we rode horses, hiked, and even went sledding down some sand dunes. It was an excellent summer, but I am ready to be back! I love teaching all of my students.
Finally, as you scroll down this page, you will see many of the various labs/activities that we conduct throughout the year. In science, we are constantly questioning different phenomona, and we can usually find creative ways to test our hypotheses. I figured it would be fun for you to see what's going on. I hope you enjoy the photos of our students DOING science.
How do different light sources affect the rate of photosynthesis in spinach leaves?
How do different light sources affect the rate of photosynthesis in spinach leaves?
The Biology class tested the effect of different light sources on the rate of photosynthesis in spinach leaves. They cut out discs of spinach leaves and used a sodium bicarbonate solution to supply the plants with CO2. Next, they used syringes to create a vaccum and pull all air out of cells until the discs sunk to the bottom of the water. Then the students immediately placed their beakers of sunken spinach discs under different light sources and measured the rate of time for the spinach discs to float which would indicate photosynthesis was occurring beacause the oxygen produced would cause the spinach discs to float.
The Biology class tested the effect of different light sources on the rate of photosynthesis in spinach leaves. They cut out discs of spinach leaves and used a sodium bicarbonate solution to supply the plants with CO2. Next, they used syringes to create a vaccum and pull all air out of cells until the discs sunk to the bottom of the water. Then the students immediately placed their beakers of sunken spinach discs under different light sources and measured the rate of time for the spinach discs to float which would indicate photosynthesis was occurring beacause the oxygen produced would cause the spinach discs to float.
Do yeast need sugar to carry out fermentation?
Do yeast need sugar to carry out fermentation?
The 7th graders tested the chemical process of alcohol fermentation by setting up two different groups of test tubes, one group with sugar and yeast, and the other with yeast and NO sugar. They then compared the two groups to see which set of test tubes produced CO2 gas which was captured in the balloons. We gathered the remaining alcohol solution which will be used in Mr. Keim's chemistry lab.
The 7th graders tested the chemical process of alcohol fermentation by setting up two different groups of test tubes, one group with sugar and yeast, and the other with yeast and NO sugar. They then compared the two groups to see which set of test tubes produced CO2 gas which was captured in the balloons. We gathered the remaining alcohol solution which will be used in Mr. Keim's chemistry lab.
Pig Dissection
Pig Dissection
The Anatomy students began their year-long pig dissection. This day was just introductory for using dissection tools and the students simply removed the dermal layers from the muscular layer.
The Anatomy students began their year-long pig dissection. This day was just introductory for using dissection tools and the students simply removed the dermal layers from the muscular layer.
What substances can pass through an egg's membrane?
What substances can pass through an egg's membrane?
The 7th grade class recently tested the phenomona of diffusion and osmosis in science class. They used vinegar to dissolve the egg's shell and then chose different solutions to place their eggs into, in order to see which substances would diffuse across the membrane. They massed out their eggs each day and compared their results to see which substances could move into or out of the egg.
Can iodine or starch diffuse across dialysis tubing?
Can iodine or starch diffuse across dialysis tubing?
The Biology students tested to see whether iodine or starch molecules could pass pass through dialysis tubing. They were comparing and contrasting different types of membrane transport and also testing the effect of hypertonic and hypotonic solutions on osmosis.
The Biology class recently tested to see the effects of temperature and pH on catalase enzyme activity.
The Biology class recently tested to see the effects of temperature and pH on catalase enzyme activity.
7th Graders learned how to use microscopes to view various tissue samples.
7th Graders learned how to use microscopes to view various tissue samples.
The Robotics class has been working on building mousetrap cars.
The Robotics class has been working on building mousetrap cars.
Anatomy students comparing eccrine (sweat) gland activity of the arms, hands, and feet.
Anatomy students comparing eccrine (sweat) gland activity of the arms, hands, and feet.
Here were some of their results.
Here were some of their results.
Mr. Keim and I took our Earth Science and Biology classes on a hike up Black Elk Peak (Harney) last spring.
NDE Science Website
NDE Science Website
Nebraska is transitioning into its new science standards. Use the below link to learn more:
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