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Geologist are often trying to learn more about Earth and its history.

It is widely accepted that the Earth is about 4.5 billion years old. For example, the Colorado river has eroded away parts of the Columbia plateau.

This follows due to the fact that sedimentary rock is produced from the gradual accumulation of sediment on the surface.

Therefore newer sediment is continually deposited on top of previously deposited or older sediment.

- are the preserved remains or traces of living things that lived millions of years ago.

Fossils can help geologists determine the age of geologic strata.

This means that its internal structure consists of layers, arranged like the skin of an onion.This is important to stratigraphic dating, which assumes that the law of superposition holds true and that an object cannot be older than the materials of which it is composed.The law was first proposed in the 17th century by the Danish scientist Nicolas Steno.They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.Let’s take a look at them and see what they have going on.

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