I am formed from time and pressure, compressing memories into solid states. What am I?

Category: Geography · Difficulty: hard

Hint: Consider something that holds history within its layers.

Answer

Sedimentary rock

Explanation

Sedimentary rock is created from layers of materials compacted over long periods, preserving history.

This is a hard geography riddle — a tricky one that takes a little thought. The answer is Sedimentary rock.

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