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This same process applies with each layer to the cake added.You can't start with the top layer and add the ones under it since there would be nothing to build on.

Instead of using layers, it involves features that cut through the rock, like a fault or a dike.

In this case, the principle states that the item doing the cutting is younger than what is being cut.

Scientists measure the proportion of carbon-14 left in the organism to determine its age.

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So, when a valley or canyon cuts through these rock layers, the principle of lateral continuity says that rocks on either side of the canyon were once joined and continuous.