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Land and its resources

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Land and its resources

  1. 1. Minerals in the Earth’s Crust<br />
  2. 2. Elements in the Earth’s crust<br />
  3. 3. Gold<br />Silver<br />Platinum<br />Natural elements<br />
  4. 4. Natural compounds- oxides<br />Haematite – <br />iron oxide<br />Cassiterite – <br />tin oxide<br />
  5. 5. Natural compounds - carbonate<br />Calcite – <br />calcium carbonate<br />Malachite –<br />copper carbonate<br />
  6. 6. Natural compounds - sulphides<br />Iron pyrite –<br />Iron sulphide<br />Galena –<br />Lead sulphide<br />
  7. 7. Hardness of minerals<br />Solubility of minerals in water<br />Action of heat on minerals<br />Properties of minerals<br />
  8. 8. Can be measured using Mohs’ scale<br />The hardest is diamond (10)<br />The softest is talc (1)<br />Hardness of minerals<br />
  9. 9. Most minerals are insoluble in water<br />Only oxides, sulphates and carbonates of potassium and sodium are soluble in water<br />Solubility in water<br />
  10. 10. Most metal oxides are stable, do not break down when heated, except less reactive metals.<br />Mercuric oxide mercury + <br /> oxygen<br />Effect of heat<br />
  11. 11. Very hard except oxides of potassium, sodium, calcium and magnesium<br />Donot dissolve in water<br />Do not decompose on heating except mercury oxide<br />Metal oxides<br />
  12. 12. Break down into metal oxide and sulphur dioxide when heated<br />Iron sulphide iron oxide + <br />sulphur dioxide<br />Sulphur dioxide bleaches acidified potassium manganate(VII) solution from purple to colourless<br />Metal sulphide<br />
  13. 13. Metal carbonate break down into metal oxide and carbon dioxide when heated<br />Calcium carbonate calcium oxide + <br /> carbon dioxide<br />Metal carbonates<br />

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