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EnglandGeologyQuick questions
Rock-forming processes
Quick questions on Igneous rock classification and textures: silica content, grain size and cooling history - Eduqas A-Level Geology
4short 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 are the named textures?Show answer
The texture (the size, shape and arrangement of crystals) is the evidence you read in the exam:
What is q1?Show answer
State the approximate silica content that defines a mafic igneous rock and name one example. [2 marks]
What is q2?Show answer
Explain why an intrusive rock is coarse-grained. [2 marks]
What is q3?Show answer
Name the texture of a rock with large phenocrysts set in a fine groundmass, and state what it shows about cooling. [2 marks]
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