Oxygen combines easily with many other elements and compounds
Oxygen is main gas of earth. If there is no oxygen in the earth all the life in the earth should die.
we get oxygen from the trees
Earth's atmosphere, including the oxygen, is bound to Earth by gravity.
There is oxygen and gravitational force on earth but there is no oxygen and gravitational force
Oxygen makes it human capable of breathing in earth that's why when there is oxygen, there is life.
No. Oxygen is not believed to have been present in the early years of Earth's history.
The oxygen isn't "used by the earth"; it is recycled by organisms. The total amount of oxygen on planet Earth remains more or less constant.
No. Oxygen is a nonmetal.
Elemental oxygen did not appear on Earth until some time after life did. In fact, the oxygen was produced by life carrying out photosynthesis. The first organisms on Earth were anaerobic, meaning their life processes did not involve oxygen. To most organisms like this, oxygen was highly toxic.
Oxygen was not present in large amounts in the early atmosphere of Earth.
If oxygen were to be removed from earth, all life forms that require oxygen to survive will die out leaving the earth as we know it baron. Oxygen is vital to our survival, without it we would die.
Earth is only one planet where gaseous oxygen is found. The Earth's atmosphere is about 21% Oxygen.