The _________ Eon occurred immediately after Earth formed as a planet.
Era's of Earth's History

Flashcard
•
Science
•
6th Grade
•
Hard
Ann Burke
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23 questions
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1.
FLASHCARD QUESTION
Front
Back
Hadeon
2.
FLASHCARD QUESTION
Front
The Precambrian Era is the first Era in Earth's _________.
Back
history
3.
FLASHCARD QUESTION
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
4.
FLASHCARD QUESTION
Front
What portion of Earth's history is taken up by the Precambrian Era?
Back
90%
5.
FLASHCARD QUESTION
Front
What was responsible for creating Earth's atmospheric oxygen and ozone layer during the Precambrian Era?
Back
Cyanobacteria through the process of photosynthesis
6.
FLASHCARD QUESTION
Front
The Paleozoic Era began with the ________ Explosion - an explosion of life forms never before seen on Earth!
Back
Cambrian
7.
FLASHCARD QUESTION
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
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