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March 14, 2013 Q-2 Pg. Science Starter : What does the Law of Conservation of Matter tell us? What are at least 2 processes that illustrate the Law of Conservation of Matter. List two ways that carbon dioxide enters the atmosphere. List two organisms that contain carbon as a solid. .

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March 14 2013 q 2 pg

March 14, 2013 Q-2 Pg.

  • Science Starter:

  • What does the Law of Conservation of Matter tell us?

  • What are at least 2processes that illustrate the Law of Conservation of Matter.

  • List two ways that carbon dioxide enters the atmosphere.

  • List two organisms that contain carbon as a solid.

Daily Goal:We will be able to explain why we never run out of carbon.

Homework: Complete your daily carbon cycle log

The nitrogen cycle
The Nitrogen Cycle

  • The Nitrogen Cycle – the series of processes which shows how nitrogen is recycled throughout the environment

Why is the nitrogen important
Why is the nitrogen important?


  • Nitrogen is important because it makes

    • amino acids and

    • nucleic acids.

Scholarly Word Alert!

DNA – deoxyribonucleic acid

Why is nitrogen important
Why is nitrogen important?

  • 80% of the Earth’s atmosphere is nitrogen gas (N2), but plants and animals can’t use it!

The nitrogen cycle1
The Nitrogen Cycle

  • Nitrogen gas (N2) must be broken down by lightning, fire, or bacteria before plants & animals can use it.

The nitrogen cycle2
The Nitrogen Cycle

  • There are four forms of Nitrogen.

    • Nitrogen gas (N2)

    • Nitrite (NO2-)

    • Nitrate (NO3- )

    • Ammonium ion (NH4+ )

  • Plants and animals can only take in nitrate(NO3- ) and ammonia (NH4+ ).


  • Nitrogen Fixation–when bacteria“fix” nitrogen from the air so the plants can use it

Table group points
Table Group Points!

  • What forms of nitrogen can plants and animals use?

Nitrate and Ammonia

How does nitrogen fixation occur
How does nitrogen fixation occur?

  • Bacteria, that live on the roots of some plants, change nitrogen into ammonia, a form of nitrogen plants can use.


  • Denitrification – is when bacteria recycle nitrogen back to the atmosphere.

    • Ammoniain the soil is converted back into nitrogen gas (N2)

The nitrogen cycle3
The Nitrogen Cycle

  • Animals (including humans) get nitrogen by eating plants.

  • Allnitrogen obtained by animals can be traced back to the eating of plants.


  • Ammonification - When plants and animals die, their bodies decompose and release ammonia back into the soil for plants to use.

Table group point
Table Group Point!

  • What else happens when living things decompose? Hint: Think of another cycle that we know.

Human impact
Human Impact

  • Burning fossil fuels and wood contributes to a large amount of nitric oxide in the atmosphere. 

  • Nitric oxide can combine with oxygen gas to form acid rain.  The acid can damage trees and kill fish. 

Table group point1
Table Group Point!

  • Acid rain speeds up another process that we learned about that is part of another cycle. What process does acid rain speed up?

Understand? Take a stand!

  • I will read a question.

  • When you know the answer, stand up!


  • I will call on students who are standing. If you answer correctly, you will get a point. If you answer incorrectly, sit down.

Where do animals get nitrogen?

By eating plants which have nitrogen!

What 3 ways can nitrogen gas be breakdown so that plants can use it?

By lightning, bacteria and fire!

EXIT TICKET the atmosphere?

  • Choose and answer 3 of the questions on the following slide. Be sure to write the QUESTION and the answer.

  • Explain the atmosphere?two waysthat nitrogen gas in the atmosphere is changed into nitrogen compounds that plants can use.

  • Compare and contrast the carbon cycle and the nitrogen cycle. List at least one way that they are similar AND one way that they are different.

  • List at least two ways in which nitrogen can get into the ground.

  • Does the nitrogen cycle ever end? Explain your answer in at least two complete sentences.

  • Without bacteria, what would happen to the nitrogen cycle? Explain why.