Earth

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

More Questions from Earth
What is the study of plant life called?
Reveal Answer
Which of these habitats is a dry one usually with sand and can sometimes be very hot?
Reveal Answer
What energy does Earth give back to space?
Reveal Answer
What is the most photographed, painted, and scaled mountain in the world?
Reveal Answer
How cold does it need to be outside before it can snow?
Reveal Answer
How often is the earth hit by lightning?
Reveal Answer
What is a tornado that doesn't reach the ground called?
Reveal Answer
What does Earth do to cause night and day?
Reveal Answer