1. Warm-up: HSA Practice Book Pages: 1-5

2. Agenda
Warm Up
Ocean Acidification Video Clip:
Biogeochemical Cycle Diagrams using Textbook.
Cycles Video Review
Partner Work Practice Half Sheet
Closing
HSA Practice for Ecology or from Website

3. Biogeochemical Cycles
Carbon cycle
Nitrogen Cycle
Water Cycle

4. Carbon Cycle
1. Plants take in carbon dioxide during photosynthesis and use the carbon to build carbohydrates.
2. Organisms release carbon in the form of carbon dioxide gas by respiration.
Carbon is a major component of all organic compounds, including carbohydrates, lipids, proteins, and nucleic acids.
3. When organisms die, decomposers break down the bodies, releasing carbon to the environment.
Ocean Acidification Video Clip:
4. Geologic forces can turn accumulated carbon into carbon-containing rocks or fossil fuels.

5. Nitrogen cycle Nitrogen Cycle Animation:
All organisms require nitrogen to make amino acids, which are used to build proteins and nucleic acids, which combine to form DNA and RNA.
Bacteria convert N gas into ammonia, nitrites, nitrates – nitrogen fixation
Primary producers use those molecules to make proteins, DNA
Consumers eat the primary producers and take the Nitrogen to make their
own proteins and DNA
4. Decomposers release the Nitrogen from decaying organisms back to the soil
5. Bacteria in soil start the process over again
Nitrogen Cycle Animation:

6. Water Cycle Water enters the atmosphere in a variety of ways:
Condensation: Water molecules gather in clouds, then rain or snow down
Evaporation: Water leaves bodies of water in a gaseous form
Transpiration: Water exits through leaves of plants
** Water can also runoff the land into lakes, rivers, oceans

7. Word Bank
CO2 (x 2)
O2 (x2)
Light
H20 (x 2)
C6H12O6 (x 2)
ATP/Energy