Earth

Approximately what fraction of the Earth's air is made up of oxygen?

More Questions from Earth
What is a worldwide increase in temperature called?
Reveal Answer
What is the boundary between two air masses called?
Reveal Answer
What is the coldest, windiest and driest place on Earth?
Reveal Answer
What is the release of water vapor from plants called?
Reveal Answer
What is the origin of dinoflagellates?
Reveal Answer
Which word means to "filter down through the soil horizons"?
Reveal Answer
Which layer of Earth's atmosphere is the very edge of space?
Reveal Answer
What is the most photographed, painted, and scaled mountain in the world?
Reveal Answer