C6.3.1 - Forming The Atmosphere Flashcards
1
Q
What are the substances which form 99.9% of the Earth’s atmosphere today?
A
Nitrogen
Oxygen
Argon
2
Q
How old is the Earth?
A
4.54 billion years old
3
Q
What is the theory for what the early atmosphere was made of?
A
The substances released by volcanoes (when the Earth first existed, there was a lot of volcanic activity)
4
Q
How is oxygen released into the atmosphere?
A
Plants and algae photosynthesise and release oxygen
