Photosynthesis part 3
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There are two main processes in the natural carbon cycle: photosynthesis and cellular respiration. Photosynthesis involves producers converting inorganic carbon like CO2 into organic compounds like glucose. Cellular respiration returns carbon back to the atmosphere as CO2. Some CO2 dissolves in the ocean and some is used by marine organisms through photosynthesis. When these organisms die, their shells and coral fall to the ocean floor forming carbonate sediments over long periods. These sediments may later emerge as dry land or mountains made of limestone.
Photosynthesis part 3
- 1. Photosynthesis The Big Picture
- 2. Carbon cycle Process by which carbon moves from organic to inorganic compounds and back Producers convert inorganic carbon (CO2) into organic carbon compounds (glucose) Primary Consumers obtain organic compounds by eating producers Secondary consumers obtain organic carbon by eating primary consumers Cellular Respiration by producers and consumers return CO2 to atmosphere
- 3. In the natural carbon cycle, there are two main processes which occur Photosynthesis Metabolism/Cellular Respiration
- 8. Carbon in Ocean and Sediments CO2 is slightly soluble Can be absorbed into water Some of the dissolved CO2 remains in the water, the warmer the water the less carbon dioxide remains in the water Some CO2 is used by algae and phytoplankton through the process of photosynthesis Coral and shelled marine organisms take up CO2 from the water and convert it into calcium carbonate When these organisms die pieces of shells/coral fall to ocean floor and make sediments The carbonate sediments are constantly being formed and redissolved in the bottom of the ocean Over long periods of time, the sediments may be raised up as dry land or into mountains This type of sedimentary rock is called limestone The carbonates can redissolve releasing carbon dioxide back to the air or water
- 11. Humans and the Carbon Cycle Combustion of any type of fossil fuel, which may include oil, coal, or natural gas Fossil Fuels formed thousands of years ago from plant or animal remains that were buried, compressed, and transformed into oil, coal, or natural gas This carbon is said to be "fixed" in place and is essentially locked out of the natural carbon cycle Humans intervene during by burning the fossil fuels During combustion in the presence of O2, CO2 and water molecules are released into the atmosphere
- 12. Photosynthesis and Global Climate CO2 makes up 0.03 percent of Earth’s atmosphere 300 parts per million Greenhouse Effect CO2 traps heat from sun in Earth’s atmosphere (otherwise it would escape into space) Not a bad thing Keeps world climate warm enough to sustain life Keeps Earth 10% warmer than it would be without CO2 Currently CO2 in atmosphere is rising 360 parts per million Burning fossil fuels Deforestation Natural Causes Photosynthesis Cellular respiration Decomposition Volcanic eruptions Ocean/limestone Global Warming Overall rise in Earth’s average temperature over a period of time