Divisions
Extinctions
Explosions
Life
Evolution
100
The division of Earth's history into smaller units makes up the _____.

Geologic Time Scale

100
the dying off of many different species of organisms over a short period in geologic time.
What is a mass extinction?
100

The change in environments that may have occurred at the end of the Paleozoic Era may have been caused by ____.

plate tectonics

100
animals with backbones
What are vertebrates?
100

This is how long ago the Dinosaurs became extinct.

What is 65 MYA

200
the largest divisions of time with the longest units of time on the Geologic Time Scale
What are eons?
200

When did Pangaea begin to split up?

The Triassic period

200
True or False The Precambrian age represents 88% of Earth's history.
What is true.
200
True or False Invertebrates, like jellies, sponges and corals also evolved during the Cambrian explosion.
What is true.
200

This is how long ago the Earth was formed.

What is 4.6 Billion Years ago?

300
Eons are divided into ___________
What are eras?
300
True or False There is evidence that some mass extinctions were caused by sudden changes in climate.
What is true. Species that are unable to survive a change in climate become extinct.
300

True or False. The tectonic forces that shaped Earth’s continents no longer have any impact on Earth’s features.

False

300

This is the Era that we are living in now.

What is the Cenozoic Era?

300

These are the three periods during the Mesozoic Era.

What are Triassic, Jurassic, and Cretaceous?

400
Eras are broken into ___________ and __________
What are periods and epochs?
400
Possible catastrophic events include A. Volcanic activity B. Asteroid Impacts C. Climate change D. All of the above.
What is D. All of the above.
400

What two features formed in North America during the Mesozoic Era?

The Rocky Mountains and an inland sea

400

Several of these cold periods have occurred during the Cenozoic Era.

What are ice ages?

400
Which of the following began the Mesozoic era? A. the break up of Pangaea B. formation of continental ice sheets C. melting of European glaciers D. extinction of dinosaurs
What is A. the break up of Pangaea
500
The Quaternary Period began about ________________ million years ago.
What is 1.8
500

Vertebrates begin to appear during which part of the Paleozoic era?

Middle Paleozoic

500
_________________________, animals with hard outer skeletons were the most commonly fossilized organisms of the Cambrian period.
What are Trilobites?
500

True or False. Reptiles can reproduce on land, while amphibians need water to reproduce.

True

500

Sea level increases when the number and size of glaciers on Earth increase. 

False

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