index fossils and dating earth layers / Relative dating — Science Learning Hub

index fossils and dating earth layers

index fossils and dating earth layers

This evidence makes it clear that life is very old and places a timescale on the pace of evolutionary change, diversification, and extinction. The method of reading the order is called stratigraphy layers of rock are called strata. If not, how do geologists figure out the different rocks from different ages? Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers. Why Science Matters. Earth Resources Fossil fuels Renewable energy What is in your mobile phone? This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks.

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