Geologic Principals in Determining Earth's History

The principal of ___ states that the processes that change the Earth today are the same processes that changed the Earth in the past.

• uniformitarianism

• superposition

• absolute

• intrusion

The principle of _____ states that layers of sedimentary rock near the surface are younger than layers of rocks deeper down, unless something has disturbed the layers.

• uniformitariamism

• superposition

• unconformity

• relativity

The principle of _____states the rock layers that contain the intrusion are older than the intrusion themselves.

• Absolute

• Unconformity

• Crosscutting

• Intrusion

A(n) _____ is a place where rock layers are missing. This area is LOST information.

• Crosscutting

• Intrusion

• Unconformity

• Superposition

TRUE or FALSE: The principle of original horizontality states that sedimentary rock layers are horizontal when originally deposited.

• True

• False

The principle of _____ states that geologic features, such as faults and intrusions are younger than the rocks layers that they cut across.

• Sedminentary

• Crosscutting

• Regoliths

• Erosion

TRUE or FALSE: Relative age describes the age of one object or event compared to another object or event.

• True

• False

____ age describes the actual age of an object or event.

• Absolute

• Relative

• Epoch

• Tectonic

TRUE or FALSE: The half-life of carbon-14 is 15,800 years.

• True

• False

Using the 5 letters in the given diagram, which layer is oldest?

• A

• B

• C

• D

• E