The document discusses several of Earth's biogeochemical cycles including the water, carbon, nitrogen, and ozone cycles. It describes the basic processes in each cycle, such as evaporation and precipitation in the water cycle, and photosynthesis and respiration in the carbon cycle. It also notes that most of the water is found in the oceans, most carbon is found in plants, soil, and oceans, most nitrogen is found in the atmosphere, and the ozone layer blocks UV light from the sun.

1. Earth’s Cycles Students will be able to Analyze each cycle and state its importance

2. Water Cycle Describes the continuous movement of water on Earth Repeating Cycle (4 steps) 1. Evaporation – Water leaves the surface Mostly the ocean surface Lakes/streams/snow melt… Plants/animals

3. Water Cycle 2. Condensation Water gas cools to form liquid (cloud) 3. Precipitation Water starts to fall back to Earth Rain, snow, sleet, hail… 4. Run off Water returns to ocean *Most water is found in the ocean*

5. Rain Shadow Caused by wind direction and mountain ranges Explains Denver’s dry climate

6. Global Weather

7. Carbon Cycle 1. Carbon taken from air by plants Used for growth to make sugars Most is used by small ocean plants (plankton) 2. Carbon released into air Animals digest sugars and release carbon to air Decomposers release carbon Burning of plant material (wood, gasoline…) Volcanic activity *Most carbon is found in Earth plants/soil/ocean*

9. Carbon Cycle

10. Carbon Cycle Effect Green House Effect Water, CO 2 , other gases trap heat Required to prevent water from freezing

12. Carbon Cycle Problem Global Warming Overheating from increased CO 2 Concern is that rising ocean temp will change entire world climate Some places wetter, some drier Melting glacier = rising sea level

13. Nitrogen Cycle Special bacteria in soil trap nitrogen in soil “ Nitrogen Fixation” - Key chemical needed to make DNA - Also key component in explosives Decomposers release nitrogen back to air *Most Nitrogen is found in atmosphere*

16. Poor Nitrogen Soils Carnivorous plants Digest insects for nitrogen

17. Ozone Layer Ozone blocks UV light Scientist noticed thinning Linked to chlorofluorocarbons (CFC)

18. CFC Ban Effect

19. Quiz

20. Homework Pick an Earth cycle and describe how it works. List where the main source would be found in that cycle.