Presentation for my 1º ESO pupil in the bilingual program. We are using the Santillana book.

1. Unit 3
WATER

2. 1- Water
- On Earth: 71% of the Earth’s surface is covered by
water (salt water is 97%, fresh water just 3%).

3. Water states

5. Seawater and continental waters

6. What are rivers?
A river is a large natural stream of water emptying into an ocean, lake, or other
body of water and usually fed along its course by converging tributaries.
Parts of a river:
-River source
-Tributaries
-Basin
-Flow (depends on the
season)

8. The world’s most
important rivers

9. Activities
Exercises 1 and 2 on page 40.

10. 2- The course and flow of a river
There are three stages in the course of a river:

11. Lower course of a river

12. The flow of a river
The quantity of water in a river is called the flow.
The more precipitation there is,
the greater the flow will be.

14. The importance of rivers
-Transport
-Water supply: Canals, reservoirs
-Electricity: dams, power stations

15. Activities
Exercises 1 to 3 on page 43.
Exercise 3 on page 48.

16. 3- Lakes, groundwater and glaciers
Different terms:
-Lake
-Lagoon (small)
-Inland sea (salt water)
Different origins:
-Precipitation
-Rivers or groundwater
-Glaciers
What are lakes?

18. Where are groundwater and glaciers found?
GROUNDWATER. Aquifers.

19. The importance of groundwater
-Drinking water
-Source for rivers and lakes
-To grow plants

21. Glaciers

22. Icebergs

23. Homework
Activities 2-3 on page 45.

24. 4- 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

27. What are currents, tides and waves?
Map of ocean currents

28. Ocean currents

29. Tides

30. Waves

31. The importance of oceans and seas
-Food
-Raw materials
-Energy
-Tourism
-Transport

32. Activities
Exercises 1, 2 (a, b) and 3 on page 46-47.

33. 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

35. Water pollution
and acid rain

37. Work at home
Exercises 1, 2, 5 and 8 on pages 48-49.

38. Practise
Go to page 50, put all your attention in understanding the
map, and then, make exercises 1 to 3 in your notebook.

39. Practise II
Go to page 51, put all your attention in understanding the
text, and then, make exercises 1 to 3 in your notebook.