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Minerals and rocks
Quick questions on Igneous rocks and their formation: cooling rate, crystal size and silica content - Eduqas GCSE Geology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is cooling rate controls crystal size?Show answer
The single most important idea is that how fast the melt cools sets how big the crystals grow:
What are classifying igneous rocks?Show answer
Igneous rocks are classified two ways at GCSE:
What is q1?Show answer
State the difference between magma and lava. [1 mark]
What is q2?Show answer
Explain why an extrusive rock is fine-grained. [2 marks]
What is q3?Show answer
Name one coarse-grained felsic rock and one fine-grained mafic rock. [2 marks]
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