earth

• What is the atmosphere


  The air around us all the time which is a mixture of gases
• what happens when the sun heats the earths surface

  some of the radiation is absorbed and some is reflected into space
• Some of the gases in the atmosphere absorb radiation which are about to be reflected into space which keeps the earth warm
• What are the names of the gases which absorb and keep radiation

  they are known as greenhouse gases and the most common ones are carbon dioxide and methane
• What is global warming

  The gradual increase in temperature of the earth
• what is global warming linked with

  the rise in carbon dioxide in the atmosphere
• What is climate change

  Long term changes to weather patterns
• what can climate change cause

  melting ice caps sea levels rising and flooding low level land
• how can u prevent climate change

  -using renewable energy sources

  -using cars less

  -buying and wasting less resources
• Metals are a natural resource with most being found joined with other elements in compounds
• what are minerals 


  naturally occurring metals and their compounds are called minerals
• What is an ore

  A naturally occurring rock which contains enough of s mineral to be worth extracting
• when metals are extracted they have to be separated from the other minerals in the ore
• If a metal is below carbon in the reactivity series it can be removed using displacement
• Displacement reaction


  Carbon+metal oxide~metal+carbon dioxide
• if the metal is above carbon in the reactivity series electrolysis can be used
• What is recycling 


  The collecting and processing of materials that have been used so that the resources can be used again
• What are the advantages of recycling?

  resources last longer

  uses less energy than extracting new materials

  reduces waste and pollution
• what are the disadvantages of recycling?


  separating rubbish can be seen as a nuisance

  the lorries collecting recycling produces pollution

  some materials are easier to recycle than others
• what is the carbon cycle?

  the process by which carbon is naturally transferred to different stores through a range of natural processes
• how does the carbon cycle work

  carbon is released into the atmosphere through combustion of fossil fuels and animal respiration and then it is reabsorbed by plants during photosynthesis
• Name three carbon sinks

  Forest soil oceans
• What is produced when iron is extracted from iron oxide

  Iron carbon dioxide