Introduction to Earth's History

The Law of Superposition helps geologists determine what?

• Age of chemicals found in rocks

• Relative age of rocks

• Absolute age of rocks

• Age of volcanoes

True or false: Absolute age is the age since the rock has been formed?

• True

• False

Magma that pushes into rock layers then cools and hardens is called a(n):

• Intrusion

• Superposition

• Extrusion

• Crack in earth's crust

Most fossils form when organisms die and are buried in:

• Ice

• Sediment

• Magma

• Amber

Which of these statements is the best way to figure out the relative age of a rock layer?

• The position of the layer compared to other layers

• The type of rocks in the rock layer

• How many fossils are in the rock layer

• The thickness of the rock layer

An intrusion is always ___________________ than the rock layers it cuts into.

• Younger

• Older

An extrusion is always ___________________ than the rock layers below it.

• Younger

• Older

Which rock layer is the oldest?

• D

• C

• B

• A

What is the relative age of layer D to layer F?

• Layer F is older than layer D

• Layer D if younger than layer F

• Layer D is older than layer F

• Layer F is the same age as layer D

What is the relative age of layer L to both intrusions?

• Layer L is younger than both intrusions

• The age of layer L can not be determined

• Layer L is older than both intrusions

• Layer L is the same age as both intrusions