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Biology, 06.05.2020 07:07 selenaK9514

The brownish gray rock with pebbles in it is called a conglomerate, and can
be seen below the obsidian in places around the museum. It has small
amounts of radioactive Potassium-40 present, at 0.625 grams. Very litde
potassium-40 is found in these types of rocks, and newly formed
conglomerate identical to this one contains only 1.5 grams of Potassium-40
How old is this rock?

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