Earth Through Time

The bottom layer is listed as the oldest. The top layer is listed as the youngest. What is this called?

• mineral content
• radioactive decay 
• the law of superposition 
• the principle of unconformity 

T/F? The climates change over time.

• True
• False

What is this a picture of?

• petrified bug
• bug trapped in tar sap
• bug trapped in hardened tree sap
• bug trapped in sediment

Which of these choices describes two kinds of trace fossils? 

• molds and casts
• shells and bones
• bee and beetle in amber
• petrified and mummified fossils 

The Law of Superposition helps scientists to determine what?

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

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

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 rock layer in the diagram seems to be the oldest?}

• F
• E
• B
• A

This rock was formed by smaller pieces of rock that settled at the bottom of a lake millions of years ago. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic

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

• A
• B
• C