How can scientists tell when a pumice deposition from a volcanic eruption was laid down?

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.

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