Soil.

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Presentation transcript:

Soil

Soil is… A combination of weathered rock (sediments), humus (decaying organic matter such as dead plants and animals), air and water

In order for soil to form… Bedrock weathers into sediments

And Organic matter (dead plants and animals) decay to form humus.

Sediments and humus mix

Quiz your partner What does soil contain? How does it form?

The Nitrogen Cycle Healthy soil contains Nitrogen for plants to absorb into their roots.

Animals eat plants to get Nitrogen Nitrogen makes proteins. So when you eat protein you are eating Nitrogen.

Protein Every structure in a living organism is made of protein…your DNA, cells, eyes, everything! So, organisms need protein and the Nitrogen to live.

Quiz your partner Why is Nitrogen important? How do plants get it? How do animals get it?

Nitrogen is now in plants and animals When the plant or animal dies, this Nitrogen returns to the soil through decomposition. Manure

The air is mostly Nitrogen Nitrogen in air gets into the soil through Nitrogen Fixing. Nitrogen Fixing bacteria in roots can change Nitrogen in the air into Nitrogen in the soil. Lightening can also fix Nitrogen.

Quiz your partner How does get Nitrogen get into the soil (there are four ways)?

Nitrogen returns from soil to the air Bacteria can change the Nitrogen in the soil back into Nitrogen in the air.

It is a cycle-draw and put your notes into the cycle

Quiz your partner Describe the entire Nitrogen cycle from the Nitrogen in the air to the soil to the plants, to the animal, back to soil and back to air.