History of Land and Life II

Age of rocks compared to the ages of other rocks.

• relative age

• absolute age

• law of superposition

• extrusion

The age of a rock given as the number of years since the rock formed.

• relative age

• absolute age

• intrusion

• extrusion

The geologic principle that states that in horizontal layers of sedimentary rock, older layers at are the bottom, younger layers are at the top.

• law of superstition

• law of superposition

• law of gravity

• extrusion

Lava that hardens on the surface.

• extrusion

• intrusion

• law of superposition

• fault

Magma that hardens beneath Earth's surface.

• intrusion

• extrustion

• fault

• fossil

A break in Earth's crust.

• fault

• unconformity

• extrusion

• intrusion

A gap in the geologic record; place where new rock layers meet older rock layers.

• fault

• extrusion

• intrusion

• unconformity

Long cylinders of ice, used to determine trends and changes in temperatures/climates.

• half life

• fault

• ice cores

• radioactive dating

The process of determining the age of an object using it's half life.

• half life

• radioactive dating

• law of superposition

• fault

The time required for half of a sample of radioactive isotope to decay (break down).

• relative age

• radioactive dating

• half life

• absolute age