Classify rocks by how they form
The idea
Igneous rock forms when molten rock cools and solidifies.
Step by step
- Igneous rock forms when molten rock cools and solidifies.
- Sedimentary rock can form from sediments pressed and cemented together.
- Metamorphic rock changes under heat and pressure without fully melting.
Example
Lava cools and becomes solid rock. Which rock group forms?
Answer
igneous rock
Cooling and solidification of molten rock produces igneous rock.
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Make three formation-process cards. Match each to its rock group, then explain why color alone is insufficient.
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