Describe the flow of matter in the nitrogen cycle - Middle School Life Science

Card 1 of 160

0
Didn't Know
Knew It
0
1 of 2019 left
Question

Where does most of Earth's nitrogen exist?

Tap to reveal answer

Answer

The answer is "in the atmosphere."
The nitrogen cycle describes the flow of the element nitrogen on Earth. Most of Earth’s nitrogen exists in the atmosphere, but it can be moved into the soil through a process called “fixation.” Fixation usually occurs with the help of bacteria, but can also be done by lightning. Bacteria help nitrites and nitrates change into a form of nitrogen used by plants to help them grow. Animals get their nitrogen by eating plants. Animal waste contains nitrogen but needs to be fixed by bacteria as well. Additionally, when animals die their nitrogen reserves are broken down by decomposers where it can again be used by plants. Denitrification is the process where nitrogen in the soil returns to the atmosphere as a gas.

← Didn't Know|Knew It →