the atmosphere
Cards (23)
- What is the approximate percentage of nitrogen in the atmosphere?
- What is the approximate percentage of oxygen in the atmosphere?
- What are some of the other gases present in the atmosphere besides nitrogen and oxygen?
- How long have the gases in the atmosphere remained relatively constant?
- How old is the Earth estimated to be?
- What was the state of the early atmosphere during the first billion years?
- How did the early atmosphere compare to the atmospheres of Mars and Venus today?
- What happened to the water vapor as the Earth cooled?
- What gases did volcanoes release during the early atmosphere formation?
- What did the weak acid react with in the sea?
- What did some of the carbon dioxide dissolve in the oceans to form?
- What did the reaction of carbon dioxide and minerals form over time?
- How did some of the carbon dioxide in the sea contribute to the formation of limestone?
- What happened to the level of carbon dioxide in the early atmosphere over time?
- When did photosynthetic algae first evolve in the oceans?
- What process produced oxygen that entered the atmosphere?
- What did the evolution of plants do to the amount of oxygen in the atmosphere?
- What is the significance of the increase in oxygen levels for animal evolution?
- What does photosynthesis take in besides producing oxygen?
- What can happen to the carbon from photosynthesis?
- What are the main changes in the atmosphere from the early period to now?
- What processes contributed to the reduction of carbon dioxide in the atmosphere?
- What is the equation for photosynthesis?