Intro to Earth Science (Part 2)

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5 Terms

1
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What were the continents made from?

Formed from solidified magma that floated up from the Mantle

2
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Right after the creation of the Earth, what was its thin atmosphere made out of?

Helium and Hydrogen

3
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Who created the first oxygen in our atmosphere?

Cyanobacteria

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What is a stromatolite?

Layered sedimentary formations primarily built by photosynthetic microorganisms like cyanobacteria

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What is the Earth’s atmospheric composition?

-Nitrogen (78%)
-Oxygen (21%)
-Others (1%)