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| Version | User | Scope of changes |
|---|---|---|
| Sep 17 2007, 9:40 AM EDT (current) | 3ora1nge6 | 1 photo added, 1 photo deleted |
| Sep 17 2007, 9:39 AM EDT | 3ora1nge6 | 1 word added |
Changes
Key: Additions Deletions
Water Cycle
The earth has a limited amount of water. That water keeps going around and around and around and around and (well, you get the idea) This cycle is made up of a few main parts:
- evaporation_when the sun heats up water (rivers or lakes or the ocean) and turns it into vapor. The water vapor goes into the air.
*transpiration_ the process by which plants lose water out of their leaves.
- condensation _Water vapor in the air gets cold and changes back into liquid, forming clouds.
- precipitation_occurs when so much water has condensed that the air cannot hold it anymore. The clouds get heavy and water falls back to the earth. (as rain, hail, sleet or snow.)
The End of the water cycle
(well not really because then it just starts ALL over again)
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Oxygen and Carbon Dioxide Cycle
Oxygen is what animals need in order to survive and carbon dioxide is what plants need for them to survive. Animals breath in oxygen and exhale carbon dioxide, while plants take in carbon dioxide and let out oxygen. - animals need oxygen to compelete an internal cycle Resperation
and
- plants need carbon dioxide for Photosynthesis.
(this cycle is continued and never stoped so there really in no end!)
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Nitrogen Cycle
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Nitrogen Cycle
- Nitrogen makes up about 78% of the atmosphere
- The only way that nitrogen get down below the atmosphere is because if nitrogen fixing bacteria, or chemosyntehic bacteria.
- Plants take nitrogen to make food and materials.Once the nitrogen is changed it is used in fertilizer, and other materials.
