Rock Dating

How are Sedimentary Rocks formed?

• Cooling and Hardening
• Heat and Pressure
• Compacting and Cementing
• Melting

Where can the oldest layer be found?

• The top layer
• The middle layer
• They are all the same age
• The bottom layer

In what kind of rock can fossils be found?

• Sedimentary Rocks
• Igneous Rocks
• Metamorphic Rocks
• Granite

Which layer formed first?

• Rock Layer W
• Rock Layer X
• Rock Layer Y
• Rock Layer Z

Which rock layer is youngest?

• A
• B
• C
• D

How old is the fossil in layer 7?

• about 1 million years old
• about 205 million years old
• about 500 million years old
• about 300 million years old

A scientist says that layers Y and M are the same age. How does he know this?

• They are found in the same type of rock.
• They are the lowest layers.
• They have the same type of fossil.
• They are near each other.

What likely caused the layers to shift?

• volcano
• weathering
• erosion
• earthquake

___________ states that the earth has changed gradually over long periods of time.

• uniformitarianism
• catrastorphism
• superposition
• disconformities

Scientists use radioactive decay to measure...

• relative time
• absolute time
• half-lives
• time of day