Change in atmosphere

• Formula for photosynthesis is

  carbon dioxide+ water= glucose+ oxygen
• Oxygen when algae began to evolve 2.7 billion treats ago. Early plants and algae began to photosynthesis. THIS DECREASED CARBON DIOXIDE IN THE AIR BECAUSE PLANTS AND ALGAE NEED IT FOR PHOTOSYNTHESIS THIS PRODUCES OXYGEN
• Carbon dioxide

  carbon dioxide dissolved in water which formed carbonate compounds which precipitated as sedimentary rocks over time
• Carbon is trapped in living organisms that have died and been buried
• Coal is formed from ancient trees in flooded wetlands where they were buried without oxygen
• Crude oil is formed from ancient planktons
• Natural gas is formed from ancient simple plants and animals
• Over millions of years heat and pressure turned the remains if living organisms into fossil fuels
• 3 greenhouse gases

  carbon dioxide

  methane

  water vapour

  too much of these gases habe cause earth to be warmer as they absorb radiation
• Deforestation and burning fossil fuels increase carbon dioxide

  farming cattle and rice in paddy fields increase levels of methane
• Greenhouse effect:

  in the last 200 years humans have vastly increased the amount of greenhouse gases in the atmosphere

  the suns energy warms earth and it’s atmosphere

  the suns heat energy warms the ground and is remitted back into the atmosphere where it can escape to space

  on the way back the carbon dioxide molecules absorb some heat

  the co2 molecules re emit the heat energy in all directions meaning that some heat energy escapes to space whereas some bounces back to earth causing the atmosphere to warm up