Earth's History - 8.E.2

__________ were used to develop the geologic time scale.

• Fossils

• Meteorites

• Sedimentary Rocks

• Igneous Rocks

Which of the following statements about the fossil record is true?

• all organisms become fossils
• organisms having soft body parts make up most of the fossils
• all organisms that have shells become fossils
• the fossil record is incomplete

The Law of Superposition helps scientists to determine what?

• The absolute age of rock layers
• The age of fossils
• The relative age of rock layers
• the super powers of rocks

According to the law of superposition, which layer is the youngest?

• A
• B
• C

What do we use radioactive decay to measure?

• Bomb radiation

• creation of fossil compounds

• relative age

• absolute age

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

Which of the following occurred relatively most recently?

• Fault A

• Intrusion B

• Folding

• Intrusion D

A geologist identifies the identical index fossils in rock layers from two different areas. Which conclusion is best supported by this discovery?

• The deposition rate of the two rock layers was identical.

• The fossil organism evolved independently in the two separate areas.

• The two rock layers were deposited at approximately the same time.

• The index fossil will also occur in sediment deposited on top of these rock layers.

Which is the most accurate method scientists use to predict the age of Earth?

• Relative dating of rock layers

• Radioactive dating of rocks

• Comparing the ages of different fossils

• Investigating core samples from the Arctic

We use evidence from ​ (a)   , ​ (b)   , and ​ (c)   to show that the Earth is constantly changing.

• fossils
• ice cores
• plate tectonics
• plants
• humans
• theories