The nitrogen in Earth's atmosphere primarily came from
A) ammonia delivered by comet impacts.
B) photosynthesis done by algae and plants.
C) oxidation of silicate-rich minerals.
D) rock delivered by asteroid impacts.
E) its primary atmosphere.

Question

Quizplus · Accepted Answer

Ammonia delivered by comet impacts is believed to have been a significant source of nitrogen in Earth's atmosphere, as ammonia can break down to release nitrogen.

The Nitrogen in Earth's Atmosphere Primarily Came from