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EnglandGeologyQuick questions
Earth structure and global tectonics
Quick questions on Earth internal structure and seismic evidence: crust, mantle, core, the Moho and the shadow zones - Eduqas A-Level 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 are the compositional layers?Show answer
The Earth is divided into concentric layers that differ in composition and state:
What is seismic evidence for the layering?Show answer
Because we cannot drill below the crust, the structure is deduced from seismic waves, which change velocity at boundaries between layers of different density and composition, and refract there. A sudden change in velocity (and the bending it causes) marks a boundary.
What is q1?Show answer
State two differences between oceanic and continental crust. [2 marks]
What is q2?Show answer
Explain the difference between the lithosphere and the asthenosphere. [3 marks]
What is q3?Show answer
Explain what the S wave shadow zone shows about the outer core. [2 marks]
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