Earth's atmosphere is composed of about 78 percent of what gas? a. carbon dioxide c. water vapor b. oxygen d. nitrogen

Nitrogen

Explanation:

The atmosphere of the earth is made of many layers of gases which surrounds the whole planet. The gases on the earth is retained by the gravity.

The nitrogen content on the earth is 78 % . It is recycled by the help of biogeochemical cycle. It is very essential for all the living components of life on earth.

Nitrogen is found in various forms on the earth some of the forms are nitrogen gas, nitrate, nitrate, nitrogen oxides et cetera.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.