They have been slowly recycled over millions of years.This is called the rock cycle.Sedimentary rocks form when tiny particles of rock that have been weathered and eroded settle out of slow moving ...
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Fossil findings reveal the surprising impact of volcanic activity on Earth's early lifeThe unusual nitrogen isotope values found in sedimentary rocks dating back 2.75 billion ... The research adds to growing evidence that Earth's nitrogen cycle was complex long before the widespread ...
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