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Igneous rock
Formed by cooled magma or lava
Extremely hot rock that cools quickly
Causes obsidian to form
Moh's hardness scale
Higher number on scale can scratch a lower number on the scale. 1 is the softest, 10 is the hardest.
Metamorphic rock
Formed when rock is changed from heat or pressure deep below Earth's surface
Sedimentary rock
Formed from small particles of rocks or other materials cemented together
Color
Gives clues to mineral composition
Mineral composition
Some rocks are made of one mineral, some are made of many
Texture
Rocks can be coarse-grained or fine-grained