PhotosynthesisPhotosynthesis

The Big PictureThe Big Picture

Carbon cycleCarbon cycle

Process by which carbon moves from organic t Process by which carbon moves from organic t inorganic compounds and backinorganic compounds and back

Producers convert inorganic carbon (CO2) into Producers convert inorganic carbon (CO2) into organic carbon compounds (glucose)organic carbon compounds (glucose)

Primary Consumers obtain organic compounds Primary Consumers obtain organic compounds by eating producersby eating producers

Secondary consumers obtain organic carbon Secondary consumers obtain organic carbon by eating primary consumersby eating primary consumers

Cellular Respiration by producers and Cellular Respiration by producers and consumers return CO2 to atmosphereconsumers return CO2 to atmosphere

In the natural carbon cycle, there are two In the natural carbon cycle, there are two main processes which occurmain processes which occur PhotosynthesisPhotosynthesis metabolismmetabolism

   

Carbon in Ocean and Carbon in Ocean and SedimentsSediments

CO2 is slightly solubleCO2 is slightly soluble Can be absorbed into waterCan be absorbed into water Some of the dissolved CO2 remains in the water, the warmer the water the Some of the dissolved CO2 remains in the water, the warmer the water the

less carbon dioxide remains in the waterless carbon dioxide remains in the water Some CO2 is used by algae and phytoplankton through the process of Some CO2 is used by algae and phytoplankton through the process of

photosynthesis  photosynthesis  Coral and shelled marine organisms take up CO2 from the water and Coral and shelled marine organisms take up CO2 from the water and

convert it into calcium carbonateconvert it into calcium carbonate When these organisms die pieces of shells/coral fall to ocean floor and make When these organisms die pieces of shells/coral fall to ocean floor and make

sediments sediments The carbonate sediments are constantly being formed and redissolved in The carbonate sediments are constantly being formed and redissolved in

the bottom of the ocean the bottom of the ocean Over long periods of time, the sediments may be raised up as dry land or Over long periods of time, the sediments may be raised up as dry land or

into mountains into mountains This type of sedimentary rock is called limestone This type of sedimentary rock is called limestone The carbonates can redissolve releasing carbon dioxide back to the air or The carbonates can redissolve releasing carbon dioxide back to the air or

waterwater

Humans and the Carbon Humans and the Carbon CycleCycle

Combustion of any type of fossil fuel, which may Combustion of any type of fossil fuel, which may include oil, coal, or natural gasinclude oil, coal, or natural gas

Fossil FuelsFossil Fuels formed thousands of years ago from formed thousands of years ago from plant or animal remains that were buried, plant or animal remains that were buried, compressed, and transformed into oil, coal, or compressed, and transformed into oil, coal, or natural gasnatural gas

This carbon is said to be "fixed" in place and is This carbon is said to be "fixed" in place and is essentially locked out of the natural carbon cycleessentially locked out of the natural carbon cycle

Humans intervene during by burning the fossil fuels Humans intervene during by burning the fossil fuels During combustion in the presence of O2, CO2 and water During combustion in the presence of O2, CO2 and water

molecules are released into the atmospheremolecules are released into the atmosphere

Photosynthesis and Photosynthesis and Global Climate Global Climate

CO2 makes up 0.03 percent of Earth’s atmosphereCO2 makes up 0.03 percent of Earth’s atmosphere 300 parts per million300 parts per million

Greenhouse EffectGreenhouse Effect CO2 traps heat from sun in Earth’s atmosphere (otherwise it would escape into space)CO2 traps heat from sun in Earth’s atmosphere (otherwise it would escape into space) Not a bad thingNot a bad thing Keeps world climate warm enough to sustain lifeKeeps world climate warm enough to sustain life Keeps Earth 10% warmer than it would be without CO2Keeps Earth 10% warmer than it would be without CO2

Currently CO2 in atmosphere is risingCurrently CO2 in atmosphere is rising 360 parts per million360 parts per million

Burning fossil fuelsBurning fossil fuels DeforestationDeforestation Natural CausesNatural Causes

PhotosynthesisPhotosynthesis Cellular respirationCellular respiration DecompositionDecomposition Volcanic eruptionsVolcanic eruptions Ocean/limestoneOcean/limestone

Global WarmingGlobal Warming Overall rise in Earth’s average temperature over a period of timeOverall rise in Earth’s average temperature over a period of time

Class Work: Class Work: Due at 8:20 am TODAY!!!Due at 8:20 am TODAY!!!

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answers answers STUDY for PHOTOSYNTHESIS TESTSTUDY for PHOTOSYNTHESIS TEST