The Nitrogen Cycle

Dr. Forrester introduces nitrogen, explaining its abundance in the atmosphere and its role in ecosystems. Nitrogen is essential for plants and animals, but they cannot use atmospheric nitrogen directly. Instead, they rely on nitrogen compounds formed through natural processes like lightning and bacterial activity. The nitrogen cycle describes how nitrogen moves through the environment, being absorbed by plants, consumed by animals, and returned to the soil. Excess nitrogen from fertilizers can harm ecosystems. Nitrogen-fixing plants like clover help balance nitrogen levels. The video concludes with a recap of the nitrogen cycle.

What happens to nitrogen when plants and animals die?

What is a nitrogen-fixing plant, and why is it important?

Describe the nitrogen cycle in your own words.