Unit 3 Review

Which process is responsible for compressing successive strata in the earth?

• Erosion

• Deposition

• Folding

• Faulting

Which process is responsible for cracks in successive strata in the earth?

• Erosion

• Deposition

• Folding

• Faulting

Why can the geologic record be analyzed by looking at different rock layers?

• All layers have the same age

• The layers have different ages with the oldest layer on top

• .The layers have different ages, with the youngest on bottom

• The layers have different ages, with the youngest on top

What can be used to determine the relative age of two rocks?

• Vertical position

• Unconformities

• Radioactive Dating

• It cannot be determined

What can be used to determine the absolute age of two rocks?

• Vertical position

• Unconformities

• Radioactive Dating

• It cannot be determined

What type of fossils are used to identify specific time periods?

• Body Fossils

• Index Fossils

• Trace Fossils

• All Fossils

What can be used to determine if two rock layers were deposited at the same time?

• Body Fossils

• Index Fossils

• Trace Fossils

• All Fossils

Which is a trait of an index fossil?

• lived for a limited time span

• found over a large area

• easily recognized

• all of the above

What do geologists use index fossils for?

• Dating rock layers

• Identifying types of rocks

• Providing evidence of climate change

• Tracking migrations