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Planetary geology
Quick questions on Uniformitarianism and space imagery: the present is the key to the past on other worlds - Eduqas GCSE Geology
6short 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 the principle of uniformitarianism?Show answer
On Earth, uniformitarianism lets us read a rock: ripples in a sandstone match those forming in rivers today, so we infer the sandstone formed in a river. Extended into space, the same logic lets us read the surface of another planet.
What is reading other worlds from space imagery?Show answer
We cannot visit most planetary bodies, but spacecraft return detailed images of their surfaces. The interpretation works by comparison with Earth: if a landform on another body looks like one we know is made by a particular process here, we infer the same process made it there. Common examples:
What is the limits of the approach?Show answer
Uniformitarianism applied to other worlds has clear limitations:
What is q1?Show answer
State the principle of uniformitarianism in a single sentence. [1 mark]
What is q2?Show answer
A planetary surface shows regular ridges of loose material like sand dunes. What process does uniformitarianism suggest, and what does it imply about the body? [2 marks]
What is q3?Show answer
Give one limitation of interpreting other planets' surfaces using uniformitarianism. [1 mark]
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