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WalesGeologyQuick questions
G1: Rock Forming Processes
Quick questions on Igneous processes and magma evolution - WJEC A-Level Geology
3short 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 q1?Show answer
Explain why partial melting of mantle peridotite produces a basaltic rather than an ultramafic magma. [3 marks]
What is q2?Show answer
State the order in which olivine, quartz, pyroxene and potassium feldspar crystallise from a cooling magma. [2 marks]
What is q3?Show answer
Explain how fractional crystallisation makes a residual magma more felsic. [3 marks]
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