Chapter 13 Earth's History

What major event marked the end of the Paleozoic?  

• Ice Age
• Mass Extinction
• Arrival of Reptiles
• A Great Flood

Which era is known as “The Age of the Dinosaurs”? 

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

When did the Paleozoic Era occur? 

• after Precambrian Time
• after the Mesozoic Era
• before Precambrian Time
• after the Cenozoic

The era that humans first appeared was 

• Cenozoic
• Paleozoic
• Precambrian
• Mesozoic

Large areas of exposed Precambrian rock are known as 

• alloys
• shields
• deposits
• continental crust

What is the first era/unit of geologic time?   

• Paleozoic
• Precambrian
• Cenozoic
• Mesozoic

By most scientific estimates, the Earth was formed ______ years ago.   

• 4.6 billion
• 4.6 million
• 46 million
• 46 thousand

How long ago did most dinosaurs go extinct?   

• 65 million years ago
• 540 million years ago
• 10,000 years ago
• 200 million years ago

The supercontinent Pangaea formed during which era? 

• Paleozoic
• Precambrian
• Mesozoic
• Cenozoic

The Precambrian Era includes _____ of Earth's history.

• 30%
• 55%
• 88%
• 97%