1. Cycles in Nature
Chapter 13 Section 2 Notes

2. Earth’s Biosphere
Earth’s biosphere contains a fixed amount of water, carbon, nitrogen, oxygen, and other materials that cycle through the environment and are reused by different organisms.

3. Water Cycle
Water cycle – how water moves from the Earth’s surface to the atmosphere and back to the surface again.
Evaporation – when liquid water changes into water vapor and enters the atmosphere.
Condensation – the process of changing water from a gas to a liquid.
When water drops become large and heavy enough, they fall to the ground as rain or other precipitation.

4. Transpiration
Evaporation

5. Condensation

6. Precipitation

7. Runoff

9. The sun is warming the surface of the water.
When a cloud gets full it begins to rain. This is called precipitation.
The water vapor cools down and forms clouds. This is condensation.
This is called The Water Cycle
Water is a liquid.
As the water gets warmer it changes and begins to evaporate.
The warm water changes into a gas called water vapor and rises up.
Water Evaporation

10. This keeps happening all the time.
The Water Cycle
Condensation
Precipitation
Evaporation
This keeps happening all the time.

11. Nitrogen Cycle
Nitrogen Cycle – the transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere.

12. Nitrogen Cycle Nitrogen Cycle Video
Nitrogen fixation – a process in which some types of soil bacteria can form the nitrogen compounds that plants need.
Farmers replace nitrogen in the soil by growing nitrogen-fixing crops or using fertilizers that contain nitrogen compounds that plants need for growth.
Nitrogen Cycle
Video

14. Carbon Cycle
Carbon cycle – how carbon molecules move between the living and nonliving world.

15. Carbon Cycle
Producers remove carbon dioxide gas from the air during photosynthesis.

16. Carbon Cycle
Respiration – the chemical process that provides energy for cells.

18. Water Cycle Internet Interactive http://www. epa
Water Cycle Internet Interactive  Nitrogen Cycle Internet Interactive  Carbon Cycle Internet Interactive 