A principle that states that geologic change occurs suddenly

The bending, tilting, and breaking of the Earth’s crust; the change in the shape of rock in response to stress

The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock

The standard method used to divide the Earth’s long natural history into manageable parts

Layers of rock

A principle that states that younger rocks lie above older rocks if the layers have not been disturbed

A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time

A principle that states that geologic processes that occurred in the past can be explained by current geologic processes

If the entire history of the Earth was compared to a 24 hour day, at what time would humans show up?

Who originated the theory of uniformitarianism?