1. Natural Cycles
The Nitrogen Cycle

2. What is Nitrogen?
The nitrogen cycle illustrates the path that nitrogen takes through the environment.

3. Nitrogen is the most abundant gas in the air. (78% of the atmosphere)
What is Nitrogen?
Nitrogen is the most abundant gas in the air. (78% of the atmosphere)

4. What is Nitrogen?

5. It is an important gas for all organisms.
What is Nitrogen?
It is an important gas for all organisms.

6. Nitrogen is present in DNA.
What is Nitrogen?
Nitrogen is present in DNA.

7. What is Nitrogen?
Plants and animals
use nitrogen to
make proteins.

8. It is colorless, odorless, tasteless, and nontoxic.
What is Nitrogen?
It is colorless, odorless, tasteless, and nontoxic.

10. Steps in the Nitrogen Cycle
❶ The nitrogen is "fixed" into a usable form for plants (nitrates and ammonia).

11. Steps in the Nitrogen Cycle
❷ Nitrates and ammonia are absorbed by plants through the soil.

12. Steps in the Nitrogen Cycle
❸ Plants use these
to make proteins.

13. Steps in the Nitrogen Cycle
❹ Then plants are consumed by animals.

14. Steps in the Nitrogen Cycle
❺ Animals return nitrogen
to the soil through waste
and decay. This process is
aided by decomposers
(bacteria and fungi).

15. Steps in the Nitrogen Cycle
❻ Nitrogen also enters the soil through precipitation. Some nitrogen in the atmosphere is "fixed", or made usable, by lightning.

16. Steps in the Nitrogen Cycle
❼ Most fixed nitrogen
remains fixed. A
small amount is changed
back into nitrogen gas
By denitrifying bacteria.

17. Steps in the Nitrogen Cycle
It’s important to remember that these steps aren’t really steps in a sequence of events. All of the processes are happening all of the time on the planet. There can be a benefit to talking about the processes as steps to get a grasp on all the mechanisms involved with nitrogen.

20. The Nitrogen Cycle Study Jam

21. Credits visionlearning.com quora.com jagranjosh.com socratic.org
slideshare.net
indiamart.com
permaculture.co.uk
yourgenome/youtube
lindseycraigsbooks.com
aplustopper.com
fuseschool/youtube

22. Natural Cycles Unit
This presentation was developed in conjunction with a three-part unit on Earth’s natural cycles, which is available in my store. The unit includes a study guide, teacher notes, leveled assignments, a vocabulary quiz, study helps, online resources, assessment, links to an editable copy of the file and slideshows, and answer keys. I hope teachers and students find it as useful and engaging as my classroom has. – Brent Holman

23. Be Sure to Get All 4 Free Slideshows in this Set!