The evolution of the atmosphere Flashcards
1
Q
What was phase 1 of the evolution of the atmosphere?
A
Volcanoes gave out gases.
2
Q
What was the atmosphere like in the beginning?
A
Mostly CO2 and no oxygen
3
Q
What was phase 2 of the evolution of the atmosphere?
A
Green plants evolved and produced oxygen.
4
Q
How did plants help to eliminate CO2 from the atmosphere?
A
They absorbed CO2 and produced O2 through photosynthesis.
5
Q
What was phase 3 of the evolution of the atmosphere?
A
Ozone layer allows evolution of complex animals.
6
Q
What is the importance of the ozone layer?
A
It blocks harmful rays from the sun allowing complex animals to live.
