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This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks.

" First, the relative age of a fossil can be determined.

In the Grand Canyon, the layers of strata are nearly horizontal.

Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.

Younger layers are deposited on top of older layers (principle of superposition).

Layers that cut across other layers are younger than the layers they cut through (principle of cross-cutting relationships).

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For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata.

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