Rocks & Weathering

Rocks = mixtures of minerals
1. Sedimentary
  1. Sediment grains stuck & deposited- soft / crumbly
    1. eg. Sandstone
  2. Porous
2. Metamorphic
  1. Interlocking crystals due to high temp & pressure
    1. Eg. Slate
  2. Hard, smooth, shiny
  3. Non-Porous
3. Igneous
  1. Interlocking crystals
  2. Molten rock cools & solidifies
  3. Very hard
    1. eg. Granite
  4. Non-Porous
4. Porous rocks
  1. Grains = gaps so water / air gets in
    1. Bubbles appear if put in water, as air escapes
      1. Mass increases in water
5. Non-Porous rocks
  1. Interlocking = no gaps for air / water
Physical Weathering
1. Temp breaks down rocks
  1. Freeze-thaw
  2. Onion skin - expand contract
Landscapes & Weathering
1. Scree slope at bottom of cliffs as breakdown & fall
Rain & Weathering
1. Rain = acidic - chemical weathering on rocks
  1. Pollution eg. sulphur dioxide = speeds up weathering
    1. Rocks change colour
Transportation
1. Pieces of rock - transported by glaciers
  1. Glaciers = slow moving rivers of ice
    1. Rocks carried then deposited when melting
      1. Smaller rocks carried further
Evaporates
1. Salts in water evapotae - leave sediment
Fossils
1. Remains of plants & animals in sedimentary rocks
  1. Fossil fuels = coal, oil, gas - take millions of years to form & non-renewable
    1. Contribute warming when burned

Resource summary

	Created by helenfines about 11 years ago