1.9 carbon cycle (sec 4.2 pg 86-91) video:
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1.9 Carbon Cycle
(Sec 4.2 pg 86-91)
VIDEO: http://www.youtube.com/watch?v=2D7hZpIYlCA
• Carbon (C) is the key element in all living organisms (our Earth is full of carbon-based life forms).
• Carbohydrates, lipids (fats) and protein are all organic compounds.
• The carbon cycle involves a lot of oxygen too; here are some important features of the cycle:– Carbon reservoirs = anything that has the ability to store
C for a long time. (forests, oceans, fossil fuels, etc)
• The carbon cycle involves a lot of oxygen too; here are some important features of the cycle:– Carbon sink = something that actively absorbs more C
than it releases. (growing forest, oceans, etc.)
• The carbon cycle involves a lot of oxygen too; here are some important features of the cycle:– Carbon source = something that releases stored C. (a
burning forest, decaying matter, burning fossil fuels, etc.)
• The carbon cycle involves a lot of oxygen too; here are some important features of the cycle:– Carbon cycle = cycling of carbon through the
environment (Fig. 2 p.87, and in your Data Pages) – Photosynthesis and respiration are responsible for most
C recycling.
• Oceans are very significant carbon reservoirs/sinks. They store C two ways: – CO2 from atmosphere is dissolved in the water and used
by aquatic producers in photosynthesis
• Oceans are very significant carbon reservoirs/sinks. They store C two ways: – Dissolved CO2 reacts with water to form calcium
carbonate (CaCO3), which is used to make shells and other structures by marine organisms (e.g. sponges, crabs)
• Fossil fuels represent a significant portion of global C reservoirs.
• They represent the decayed C from organisms that have died and were buried before they were fully decomposed.
• Fossil fuels include coal, oil, and gas
• Burning fossil fuels releases CO2, which is a greenhouse gas (GHG).
• GHG’s collect in the atmosphere and trap heat from the Sun inside the atmosphere, leading to the greenhouse effect (Fig.3 p.88).
• The greenhouse effect is responsible for life as we know it on Earth (it keeps the planet warm), but many believe increasing GHG levels is causing climate change.
• Respiration that occurs with oxygen present is called aerobic respiration.
• This is the most common type of respiration, and is another term for cellular respiration.
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