What geological structure at Jezero Crater serves as evidence that a river once flowed there?
Answer
A fan-shaped river delta
When a river enters a standing body of water, its velocity decreases, causing it to deposit sediment in a distinct fan-shaped pattern. This delta is clearly visible from orbit and contains sedimentary layers that act as a geological archive, documenting the history of the environment and the water that once flowed through the crater.
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