Understanding Geologic Time

How do geologists describe the age of Earth compared to how we describe our age?

• In terms of centuries

• In terms of millions or billions of years

• In terms of decades

• In terms of days and months

What does the law of superposition state about sedimentary rock layers?

• All rocks are the same age

• Older rocks are found at the top

• Younger rocks are found at the bottom

• Younger rocks are found at the top

Which analogy is used to explain the concept of relative time in geology?

• A stack of books

• A stack of pancakes

• A stack of plates

• A stack of cards

What is an example of an absolute geologic age given in the video?

• A desert estimated to be 200 years old

• A cinder cone volcano estimated to be 900 years old

• A river estimated to be 1000 years old

• A mountain estimated to be 500 years old

How do modern geologists determine the age of rocks and fossils?

• By guessing based on appearance

• Using a variety of techniques for accurate dating

• By comparing them to modern objects

• By asking local historians