The amount of nitrogen in the atmosphere is affected by: A) sewage treatment plants

B) inorganic nitrogen fertilizers

C)pollution from factories

D)all of the above

all of the above

Explanation:

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers