Unit 3 - WATER

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1º ESO BILINGUAL HISTORY. SANTILLANA CLASS BOOK

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Unit 3 - WATER

  1. 1. Unit 3 WATER
  2. 2. 1- Where is water found? - On Earth: 71% of the Earth’s surface is covered by water (salt water is 97%, fresh water just 3%).
  3. 3. Activities Exercises 1 and 2 on page 25.
  4. 4. 2- What are rivers? -River source -Tributaries -Basin -Flow (depends on the season)
  5. 5. The importance of rivers -Transport -Water supply: Canals, reservoirs -Electricity: dams, power stations
  6. 6. Activities Exercise 1 on page 26
  7. 7. 3- What are oceans and seas? They hold almost all the world’s liquid water, that is salt water. Salinity is different depending on if the sea is warmer or colder. Warm = + salt Cold = - salt
  8. 8. The importance of oceans and seas -Food -Raw materials -Energy -Tourism -Transport
  9. 9. 4- What are currents, tides and waves? Map of ocean currents
  10. 10. Ocean currents
  11. 11. Tides
  12. 12. Waves
  13. 13. Activities Exercise 1 on page 28.
  14. 14. 5- What are lakes? Different terms: -Lake -Lagoon (small) -Inland sea (salt water) Different origins: -Precipitation -Rivers or groundwater -Glaciers
  15. 15. Activities Exercise 1 on page 29.
  16. 16. 6- Where are groundwater and glaciers found? GROUNDWATER. Aquifers.
  17. 17. Hot and cold springs
  18. 18. The importance of groundwater -Drinking water -Source for rivers and lakes -To grow plants
  19. 19. Glaciers
  20. 20. Icebergs
  21. 21. Homework Activity 1 on page 30.
  22. 22. 7- What problems are related to water today? WATER CONSUMPTION AND DISTRIBUTION -3% Fresh water -> 0,014% available -Increase in population -> increase in consumption -Bad distribution -Consequences: droughts or floods
  23. 23. Water pollution and acid rain
  24. 24. Activities Exercises 1 and 3 on page 31.
  25. 25. Work at home Exercises 1, 4 and 5 on pages 32-33.

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