Students usually find this concept challenging. Here's a chance for you to watch my demonstration and example again:
Igneous Rocks Introduction with real rocks: https://youtu.be/I3WbXArqS0I
Sedimentary Rocks Introduction with real rocks: https://youtu.be/w_JJN3tqgzk
Metamorphic Rocks Introduction with real rocks (PART 1): https://youtu.be/pKDe48rj_A0
Metamorphic Rocks Introduction with real rocks (PART 2): https://youtu.be/W-h2WHmAnnM
Rocks Part 1 - Igneous: https://youtu.be/vzS2VtPn
Rocks Part 2 - Igneous: https://youtu.be/SoRVlqpgGVw
Rocks Part 3 - Sedimentary: https://youtu.be/wmSlZK_2s3k
Rocks Part 4 - Sedimentary: https://youtu.be/c0uNExUXCcI
Rocks Part 5 - Sedimentary: https://youtu.be/jo8tp-zW9PY
Rocks Part 6 - Metamorphic: https://youtu.be/-E-v4a0IofQ
Rocks Part 7 - Metamorphic: https://youtu.be/mJyIfSQpmPQ
Rocks Part 8 - Metamorphic: https://youtu.be/eOTtXwns2oA
Rocks Part 9 - The Rock Cycle: https://youtu.be/nN7Vg9jAp4g
Rock Identification Review video: https://youtu.be/aGNfVGdOkow
Answers for Review 105: https://youtu.be/0v2zLEzkwkM