Physical samples of rock extracted (taken) from deep within Earths crust.
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Direct evidence are visible noticable changes. Indirect evidence is when you might not see the action happen but you do notice the results
Evidence is important in science because if you are doing a science BCR, you will have to have evidence in your BCR in order to make your BCR true.
Insist on evidence.
In science books or on the internet.
Critical