4.9- carbon cycle

- photosythesis- reduces atmospheric CO2
- feeding- carbon is being passed along the food chain
- respiration- adds CO2 to the atmosphere, all organisms
- decomposion- death of all the organisms, broken down by bacteria and fungi and releases CO2
- combustion- fossil fuels release CO2 i.e industry, cars

4.14 enhanced greenhouse gases

- when gases increase in concentration
- the UV rays are increasingly re-emitted, warming the earth
- this is global warming
- this can lead to: melting ice caps, raising sea levels
- climate change happens

4.13 greenhouse gases

- burning of fossil fuels = CO2, NO2, SO2
- farming- cows emitt methane
- evaporation of water- clouds contribute to greenhouse effect
- canned sprays- CFC's break down the ozone layer

4.12 greenhouse effect

- UV light comes from the sun
- 50% of this is reflected
- UV light is is converted as infrared and absorbed
- infrared gets emitted back out
- greenhouse gases re-emitts and re-distributes infrared
- more greenhouse gases = more heat
- CFC's break down the ozone layer

4.11 gas pollution

- burning of fossil fuels results in sulphur dioxide gas
- this comes from factories and cars
- SO2 + H2O = sulphuric acid = acid rain
- acid rain can kill fish in the lakes and rivers
- carbon monoxide - fossil fuels are burned without oxygen
- blocks haemogloblin from carrying oxygen
- can lead to death