Relative age of rocks

Front

A rock that is formed underneath the Earth by heat and pressure is called:

Back

Metamorphic rock

Front

Which rock layer is probably the oldest?

Back

Layer 6

Front

What scientific law states that in horizontal sedimentary rock, the oldest layers are at the bottom?

Back

Law of Superposition

Front

According to the law of superposition, where are the oldest fossils found?

Back

Near the bottom of the rock layers

Front

What states that a fault or a body of rocks must be younger than any feature or layer of rock that the fault or rock body cuts through?

Back

Law of Crosscutting

Front

What type of rock is formed from cooled magma or lava?

Back

Igneous rock

Front

What is the process called when sediment is compacted and cemented together to form rock?

Back

Lithification

Front

What type of rock is formed from the accumulation of sediment?

Back

Sedimentary rock

Front

What is an index fossil?

Back

A fossil that is used to define and identify a particular time period in the geological time scale.

Front

What is the principle of original horizontality?

Back

Layers of sediment are originally deposited horizontally under the action of gravity.