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The Nitrogen Cycle

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Ava Dejonge

on 20 September 2014

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Transcript of The Nitrogen Cycle

The Nitrogen Cycle
Nitrogen Cycle
The continuous sequence of events by which atmospheric nitrogen and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants, the substances returning to the air and soil as a result of the decay of the plants and denitrification.
Nitrogen Cycle
Animal eats grass .
1. There are many steps to the nitrogen cycle
including fixation, nitrification, assimilation, and

Plants waste mixes
with the animal waste, and then bacteria goes into the ground.
1. Plants nitrogen comes directly from
the soil.
Bacteria goes up towards the surface and into the plant.
The plant lets off "sweat" called transpiration and then evaporates into the atmosphere then the water condensates to form clouds.
The clouds get heavy and it precipitates so the nitrogen in the water goes into the soil and the plants absorbs the water which contains nitrogen.

1. Animals get their nitrogen needs met by eating plants or eating animals that eat plants.
1. Most of the nitrogen on earth is in the the atmosphere
2. Nitrogen is used by many farmers as a fertilizer which helps plants grow.
2. After a plant dies, it decomposes where bacteria turn the nitrogen back into ammonium through a process called ammonification.
2. After fixation, bacteria uses nitrification to turn ammonium into nitrates which is usable by plants.
2. Approximately 80% of the molecules in Earth's atmosphere are mad of two nitrogen atoms bonded together (N2)
1. Too much nitrous oxide in the atmosphere can cause acid rain.

Fun Facts:
1. Once nitrogen has been fixed, plants can absorb nitrogen through their roots from the soil in a process known as assimilation.
2. Roughly 78% of the atmosphere is made of a non-usable form of nitrogen gas
2. Humans alter the nitrogen cycle by using synthetic fertilizers on lawns which adds to much extra nitrogen to the soil.
And now the cycle will repeat.
1. The cycle will start over with the animal eating the grass
The animal takes a poop in which contains

1. this is one of the most important pats of the cycle,
this where it gets into the ground where the bacteria carries to the next step.
2. This is also called the Nitrification stage.
3. Nitrogen is odorless, tasteless, and colorless
4. The French chemist Antoine Laurent Lavoisier named nitrogen azote, meaning without life.
5. Nitrogen is a nonmetal.

6. Nitrogen has a valence of 3 or 5.
7. Nitrogen is responsible for the orange-red, blue-green, blue-violet, and deep violet colors of the aurora.
8. The term nitrogen cycle refers to a series of reactions in which the element nitrogen and its compounds pass continuously through Earths atmosphere, lithosphere, and hydrosphere,
How humans effect the nitrogen cycle:
1. Human activities such as fossil fuels and other artificial nitrogen fertilizers can damage the global nitrogen cycle.
2. The release of nitrogen in waterways have also done they're damage
3. deforestation, human population growth have all effected the nitrogen cycle in bad ways such as taking down trees and open land for wildlife.
9. Nitrogen compounds are found in foods, fertilizers, poisons, and explosives. Your body is 3% nitrogen by weight.
By: Ava DeJonge, Jocelyn Conroy-Flynn, and Shannon Warner
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