Earth's Atmosphere Worksheet: Early Earth & Balance
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1. When Earth was 1st formed, what gases did the Earth’s atmosphere
consist of?
2. Volcanoes causes what gases to spew into the atmosphere?
3. The first bacteria was developed
a. 2 billion years ago
b. 3 billion years ago
c. 4 billion years ago
d. 4.5 billion years ago
4. Today how do plants and animals keep the atmosphere balanced?
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