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Life Science - Cycles in Nature
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Cycles in Nature
Ms.Lovell
Life Science
Water Cycle
The water you drink is dinosaur pee!
There is NO NEW WATER.
Our water is the same water that Cleopatra drank, that your ancestors drank, and that your neighbors drank.
Water Cycle
How it works
Nitrogen Cycle
Nitrogen is an important part of all proteins, and also part of the DNA in all organisms.
Nitrogen is a gas in our atmosphere, but most organisms can't get it through the air.
Plants only absorb nitrogen through their roots and animals only get it from the food they eat.
Nitrogen Cycle
How it works
Carbon Cycle
Carbon is found in the molecules of living organisms. It is also formed in soil when dead organisms decay, and it is found as a gas (Carbon Dioxide) in the atmosphere.
Carbon Cycle
How it works
Energy Flow
All living things are made of matter, and all living things need energy. Matter and energy get recycled, just like the water, nitrogen and carbon cycles we talked about.
Energy Flow
Energy Transfer
We talked yesterday about how producers (plants) use sunlight to make energy, and consumers get their energy from eating other living things.
Energy Transfer
Food Chain
Last week you made a food chain. This is one way of showing how energy and matter pass from one organism to another.
Food Chain
Food Web
Lots of times the feeding relationships between living things are too complex to show in a food chain, so a food web is used.
A food web shows all the possible feeding relationships between the living things in an ecosystem.
Food Web
Energy Pyramid
Energy Pyramid
An energy pyramid shows the amount of energy available at each feeding level in an ecosystem.
The bottom of the pyramid shows all the producers, and it is the largest level because it has the most energy and most organisms.
As you move up the pyramid, the transfer of energy is less efficient and each level is smaller. Only about 10 percent of energy is transferred to the next level.