Earth's History

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

• A
• B
• C

Which division on the geologic time scale is the shortest?

• epoch
• era
• eon
• period

If an index fossil is found in two rock layers that are separated by an ocean, what do you know about the relationship between the two rock layers?

• they are about the same age
• they used to be in the same area
• the are made of the same kind of rock
• the rock layers are unrelated

Which type of dating method can be used on rock layers by applying the Law of Superposition?

• relative dating
• absolute dating
• radioactive dating
• radiometric dating

• 1
• 2
• 3
• 5

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

Most events on the geologic timeline happened:

• a long time ago, near the beginning
• more recently, near the modern time
• evenly spread out
• right in the center of the timeline

_{Which of the following questions can be answered by studying  these fossil layers?} 

• What did the fish eat?
• Which organisms lived before/after/or at the same time?
• Why did dinosaurs become extinct?
• Are reptiles the ancestors to birds or fish?

_{^{When scientists use logic to determine the age of one fossil compared to another, they use this type of dating.}}

• Relative
• Carbon
• Absolute

Relative age of a rock is the number of years that have passed since the rock formed?            

• true
• false