Water is found in oceans, ice/snow, underground, in the atmosphere, and within living things. Sea water is salty due to dissolved gases, while fresh water is found in streams, glaciers, rivers, lakes, and underground. The water cycle describes the continuous movement of water on, above, and below the Earth's surface through processes like evaporation, condensation, precipitation, and runoff.

2. Do you know……..?
 Where can we find water in our planet?
 How is sea water different to water in rivers?
 What is the water cycle?
 Why is important not to waste water?
 Some easy ways to save water?

5. WHERE IS THERE WATER ON EARTH?
 97% of water on Earth is salt water. It is found in
the oceans.
 3% of water on Earth is fresh water. It is found in:
 Ice and snow from glaciars.
 Below the surface: groundwater.
 In the atmosphere.
 On the surface.
 In living beings.

6. PROPERTIES OF WATER
 The water molecule is made up of three atoms: H2O
 Water:
 Has no colour, no taste and no smell.
 Is a poweful solvent.
 Absorbs heat: so, water moderates the Earth’s climate by
absorbing heat in summer and emitting heat in winter.
 Freezes at 0 ºC.
 Has cohesion and adhesion.

7.  Cohesion
 Adhesion

8. SEA WATER
 Sea water is salty.
 It contains dissolved gasses: these gasses are
dissolved in the water by two process:
 The movement of the waves.
 The aquatic beings.

9.  The temperature varies with depth:
It is highest at the surface.
It is lower in the deepest
zones.

10.  MOVEMENTS PRODUCED IN THE OCEANS:
 Waves: occur on the surface, and they are caused by the
wind. Waves mix water with the air above the surface,
dissolving a lot of oxygen.

11.  Currents: are masses of water which move like rivers
through the sea. They are produced by wind, and
differences in salinity.

12.  Tides: are the periodic rise and fall of the sea level. They
are caused by the gravitational attraction of the Moon
and the Sun.

15. FRESH WATER
 Fresh water is found on the continents.
 It contains much less salt than sea water.
 It is found in different forms:
 Streams: are water courses fed by rain.
 Glaciers: are formed from the accumulation of snow on mountain
tops.
 Rivers: are permanent water courses.
 Lakes: are masses of water contained on depressed areas.
 Groundwater: is water beneath the ground surface.
 Wetlands: are areas where the ground is inundated all year round.

17.  Is the movement of water around, over and through
the Earth. It consist on these processes:
 Evaporation.
 Evapotranspiration.
 Condensation.
 Precipitation.
 Surface Runoff.

18.  Evaporation: liquid water changes to gas. Water
passes from the hydrosphere to the atmosphere.

19.  Evapotranspiration: water evaporates from the
leaves of plants.

20.  Condensation: Water vapour changes to liquid,
forming clouds.

21.  Precipitation: water in the clouds falls to the
ground.

22.  Surface Runoff: surface water moves across the
land, forming rivers and streams.

23.  Infiltration: surface water filters into the
ground, using the pores in the rocks.

26. El Modelado del Relieve por el Agua
http://www.edistribucion.es/anayaeducacion/8420534/U09/U09_01_EPI_04/v
ideo_modelado_paisaje.html
Las Aguas Contaminadas
http://www.edistribucion.es/anayaeducacion/8420534/U09/U09_01_EPI_05/
video_9_5_nb/index.html