SME
Grade 12 Science · Problem type
Intrusive or extrusive?
Use this for “A rock has large crystals. Did it cool quickly or slowly?”
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Where did this rock cool?
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Assumptions
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Slow cooling gives crystals time to grow large; fast cooling leaves tiny crystals or glass.
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Gas escaping from lava as it cools leaves holes.
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Minerals and rocks: properties and how they form
Main lesson
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Silicate or not?
Use this for “Which of these minerals is a silicate?”
Cleavage or fracture?
Use this for “Does this mineral break along flat planes or along curved surfaces?”
Foliated or nonfoliated?
Use this for “Is gneiss foliated? What was its parent rock?”