1. Cycles of Matter
Chapter 21- Section 2

2. Matter is limited- must be recycled and reused!
Matter includes:
water
carbon
nitrogen
oxygen
And others
Matter is limited- must be recycled and reused!

3. The Water Cycle
The processes of evaporation, condensation, and precipitation make up the water cycle
Evaporation: liquid water absorbs energy and changes to a gas
Energy is from the
heat of the sun

4. Precipitation: rain, snow, sleet, hail
Condensation: water vapor (gas) turns back into a liquid (water droplets)
Droplets form clouds
Precipitation: rain, snow,
sleet, hail

6. The Carbon Cycle
Producers take in carbon dioxide gas from the air during photosynthesis
Use carbon to make food (sugars)
Consumers eat producers and release carbon dioxide and water as waste
When producers and consumers die, decomposers break down their remains and return carbon to the soil

8. The Oxygen Cycle
Producers release oxygen as a result of photosynthesis
Organisms take in oxygen (from air or water)

9. Human Impact Our activities impact the levels of carbon and oxygen
Burning fuels release carbon dioxide
Removing trees= fewer producers to absorb carbon dioxide

10. The Nitrogen Cycle
Moves from air  soil  living things  back into the air
Air is 78% nitrogen gas, however most organisms cannot use it until it has been “fixed”
Fixed means it has been combined with other elements…process called nitrogen fixation, performed by bacteria