4.9 Carbon Cycle

• C02+H20 are combined in photosynthesis using light energy. 
• Light energy is trapped and used to form organic molecules such as glucose. 
• The C02 comes from the atmosphere which makes 0.03% of the atmosphere. 
• Photosynthesis is responsible for reducing the atmospheric C02.
• The passage of carbon through the various trophic level we have identified the producer but then producers are eaten by primary consumers.  
• The primary consumer takes in the carbon from the producer and uses it to reconstitute body materials so it grows.

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4.14 Enhanced Greenhouse Effect

• Water Vapor, Methane and Carbon dioxide are all greenhouse gases. 
• Greenhouse gases changes the climate. 
• The UV rays are increasingly re-emitted which warms the earth's surface. 
• Melting ice case, raising sea levels can happen due to Greenhouse gases.

4.13 Greenhouse Gases

• Burning of fossil fuels - N02, C02, S02.
• Evaporation of water. 
• Canned spray - Deodorant, Room freshener. 

4.12 Greenhouse Effect

• UV light comes from the sun. 
• UV light is converted as infrared and absorbed. 
• 50% of UV light is reflected. 
• The more the greenhouse gases the more heat there is. 
• Infrared gets emitted back out.

4.11 Gas Pollution

• The burning of fossil fuels results in sulphur dioxide gas. 
• Sulphur dioxide happens mostly because of factories and cars. 
• Acid rain kills fish in lakes and rivers. 
• Carbon monoxide blocks hemoglobin which can lead to death. 
• S02+H20 -Sulphuric acid - Acid rain.