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https://www.texasgateway.org/resource/food-chains-food-webs-and-energy-pyramids

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A gateway to the resources you need. For your classroom. For yourself.

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https://www.texasgateway.org/resource/energy-and-matter-ecosystems

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Put your hand on top of your head and let it rest there a minute. What do you feel? Did you notice it was warm up there? Why is heat coming from the top of your head? Where is it generated? Did you say it's generated from cell metabolism? Good answer!

The term cell metabolism stands for all the chemical reactions the cell uses to process matter and access energy to function correctly. One way cells accomplish this is by breaking down the foods we eat for the raw materials and the energy that was stored in the chemical bonds. In this resource, you'll look at matter and energy in food from a consumer's perspective. After all, we're consuming food to nourish our cells but as consumers, we also play a part in a bigger picture known as the ecosystem.

Watch the the video below and get ready to take down some data so you can answer two questions about the available matter and energy in yummy cashews.

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Put your hand on top of your head and let it rest there a minute. What do you feel? Did you notice it was warm up there? Why is heat coming from the top of your head? Where is it generated? Did you say it's generated from cell metabolism? Good answer!

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https://www.sciencelearn.org.nz/image_maps/3-carbon-cycle

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Explore this interactive diagram to learn more about the global carbon cycle.

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https://www.sciencelearn.org.nz/resources/960-the-nitrogen-cycle

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Nitrogen is the most abundant element in our planet's atmosphere. Approximately 78% of the atmosphere is made up of nitrogen gas (N ₂).

Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.

As part of these life processes, nitrogen is transformed from one chemical form to another. The transformations that nitrogen undergoes as it moves between the atmosphere, the land and living things make up the nitrogen cycle.

Fixation

Nitrogen in its gaseous form (N ₂) can't be used by most living things. (Plants for example, do not have the required enzymes to make use of atmospheric nitrogen.) It has to be converted or 'fixed' to a more usable form through a process called fixation. There are three ways nitrogen can be fixed to be useful for living things:

Biologically: Nitrogen gas (N₂) diffuses into the soil from the atmosphere, and species of bacteria convert this nitrogen to ammonium ions (NH₄⁺), which can be used by plants. Legumes (such as clover and lupins) are often grown by farmers because they have nodules on their roots that contain nitrogen-fixing bacteria. Learn more about this process in the article The role of clover.

Through lightning: Lightning converts atmospheric nitrogen into ammonia and nitrate (NO₃) that enter soil with rainfall.

Industrially: People have learned how to convert nitrogen gas to ammonia (NH₃⁻) and nitrogen-rich fertilisers to supplement the amount of nitrogen fixed naturally.

Decomposition

Plants take up nitrogen compounds through their roots. Animals obtain these compounds when they eat the plants. When plants and animals die or when animals excrete wastes, the nitrogen compounds in the organic matter re-enter the soil where they are broken down by microorganisms, known as decomposers. This decomposition produces ammonia, which can then go through the nitrification process.

Nitrification

Nitrifying bacteria in the soil convert ammonia into nitrite (NO ₂⁻) and then into nitrate (NO ₃⁻). This process is called nitrification. Compounds such as nitrate, nitrite, ammonia and ammonium can be taken up from soils by plants and then used in the formation of plant and animal proteins.

Denitrification

Denitrification completes the nitrogen cycle by converting nitrate (NO ₃⁻) back to gaseous nitrogen (N ₂). Denitrifying bacteria are the agents of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere.

Nitrogen compounds and potential environmental impacts

Agriculture may be responsible for about half the nitrogen fixation on Earth through fertilisers and the cultivation of nitrogen-fixing crops. Increased nitrogen inputs (into the soil) have led to lots more food being produced to feed more people - known as 'the green revolution'.

However, nitrogen in excess of plant demand can leach from soils into waterways. The nitrogen enrichment contributes to eutrophication.

Another problem can occur during nitrification and denitrification. When the chemical process is not completed, nitrous oxide (N ₂O) can be formed. This is of concern, as N ₂ O is a potent greenhouse gas - contributing to global warming.

A balance of nitrogen compounds in the environment supports plant life and is not a threat to animals. It is only when the cycle is not balanced that problems occur.

Some common forms of nitrogen

Nature of science

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Nitrogen is the most abundant element in our planet's atmosphere. Approximately 78% of the atmosphere is made up of nitrogen gas (N2).

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https://www.quia.com/cz/9119.html?AP_rand=519345398

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If you complete everything else and have time, you may attempt to win the $1,000,000. Show me the winning score to claim a bonus stamp before class ends.
https://www.quia.com/rr/463821.html