Era's of Earth's History

Front

The _________ Eon occurred immediately after Earth formed as a planet.

Back

Hadeon

Front

The Precambrian Era is the first Era in Earth's _________.

Back

history

Front

Cyanobacteria make their own food by using the sun's energy to convert water and CO2 to sugars and oxygen. What is this process called?

Back

photosynthesis

Front

What portion of Earth's history is taken up by the Precambrian Era?

Back

90%

Front

What was responsible for creating Earth's atmospheric oxygen and ozone layer during the Precambrian Era?

Back

Cyanobacteria through the process of photosynthesis

Front

The Paleozoic Era began with the ________ Explosion - an explosion of life forms never before seen on Earth!

Back

Cambrian

Front

True or False: In the Precambrian Era, the trilobite became the world's first abundant species and one of the first Index Fossils.

Back

False

Front

During the _____________Era, plants, insects and animal life moved from the oceans to the land.

Back

Paleozoic

Front

A vertebrate is an animal with a backbone.

Back

True

Front

During the Paleozoic Era, a supercontinent named ___________ formed.

Back

Pangea