I have many forms, each telling a tale, yet I can never be touched. What am I?

Category: Science · Difficulty: expert

Hint: Think about the Earth's history written in layers.

Answer

A geological stratum

Explanation

A geological stratum represents a layer of rock or soil with internally consistent characteristics that distinguishes it from other layers.

This is a expert science riddle — one of the harder riddles here. The answer is A geological stratum.

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