rock cycle

• 3 main types of weathering:

  1.physical weathering

  2.chemical weathering

  3.biological weathering
• Sedimentary rocks are formed by weathering, erosion, deposition, compaction, and cementation.
• weathering: breaks rocks into smaller pieces
• erosion: the wearing away of rock by water, wind, or ice
• compaction: the exertion of force on something so that it becomes more dense
• cementation: the binding together of particles or other things by cement.
• transport: moves sediments far away from the original rock
• sedimentary rocks take hundreds of years to form
• deposition is the settling of sediments
• examples of igneous rock:

  -basalt

  -obsidian

  -granite
• you can recycle

  1. paper
  2. metals
  3. plastic
• materials originally come from the earths crust ,atmosphere and oceans
• phosphorous is used to make fertilisers and it is estimated to run out between 2060 and 2110
• gold is used to make jewellery and electrical connectionsand it is estimated to run out in 2040
• tin is used to make food containers and solder, it is estimated to run out in 2030
• aluminium is used for aeroplanes, kitchen foil, cans,batteries etc.

  It is estimated to run out in 2500