Tag: biogeochemical cycle

Questions Related to biogeochemical cycle

Multiple choice biology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

In a volume of air near the earth's surface, _____________ occupies 78 percent and _____________ nearly 21 percent.

  1. Nitrogen, oxygen

  2. Hydrogen, oxygen

  3. Oxygen, hydrogen

  4. Nitrogen, water vapor

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's atmosphere is composed of approximately 78 percent nitrogen and 21 percent oxygen by volume.