Earth's History

Which layer is the oldest?

• 3
• 4
• 1
• 5

What occurs at the end of a geologic era?

• flood
• extinction
• comet
• mountains form

What will most likely happen to a species of fish if all the female fish are caught?

• The male fish will move away.
• The male fish will build homes to raise their young.
• The species will not survive.
• The young fish will starve.

The longest Era was...

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

Trilobites are found in the _____________.

• Cenozoic
• Mesozoic
• Paleozoic
• Cretaceous

The Precambrian is the ___________ time span in Earth's history.

• youngest
• latest
• earliest
• middle

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

Current scientific evidence shows that the Earth is estimated to be: 

• Less than 1 millions years old
• Between 3 and 4 billion years old
• More than 4 billions years old
• Less than 2 billion years old

Which word best describes relative dating?

• Older
• 14 years old
• 2017
• 4.6 million years ago