Page 102 - Journeys Through Society-7

Water Conservation 5. Cut off the water supply to any area in the home
that is not in use.
Steps for water conservation are as follows:
6. Spread awareness among people about water
1. Avoid wastage of water at home.
conservation.
2. Use rainwater to water the plants in the house.
7. Never throw water away; use waste water for
3. Fix leaky taps, repair them and do not let them run
some other purpose wherever possible.
when not in use.
4. Practise rainwater harvesting.

Revision Notes

• The Earth has a lot of water.
• Most of the Earth's water is saline and is found in oceans and seas.

• The movement of water from the hydrosphere to the atmosphere, and then to the lithosphere and
biosphere, and back to the hydrosphere is known as the water cycle.
• Oceans make up 71 per cent of the Earth's surface and are interconnected.
• Sometimes earthquakes and volcanic activities deep down on the ocean floors give rise to gigantic
waves called tsunamis, which travel at great speed and are like gigantic walls of water.
• Warm ocean currents are light and flow along the surface of oceans.

• Cold ocean currents are dense and flow below the surface of oceans.
• Exceptionally high tides are caused during full moon and new moon days. Such tides are called spring
tides.
• When the Moon is in its first and last quarter, neap tides occur.

Evaluation Corner

Multiple Choice Questions

• Choose the correct option: OMR Sheet
1. This causes ocean currents:
Use only blue/black ball
a. Gravitational pull of the moon pen to fill the circles. It
should be darkened
b. Difference in temperature
completely and properly.
c. Molecular movement of water Wrong methods
d. None of the above
Correct method
2. These are destructive waves:
a. Tsunamis b. Cyclones
c. Tornadoes d. Tides 1. a b c d

3. This is a warm ocean current.
2. a b c d
a. Peruvian current b. Labrador current
3. a b c d
c. Gulf stream d. Tsunami

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