NCERT Solutions for Chapter 5 Water Class 7 Geography
Book Solutions
1(i)
Answer
Precipitation means any thing falling from the sky which include rain, snow, hail etc. on the surface of the earth when they become too heavy and unable to float in the air.
1(ii)
Answer
The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.
1(iii)
Answer
Factors affecting the height of the waves:
(i) Speed off wind
(ii) Duration of wind
(iii) Distance the wind blows over water
(iv) Underwater landslides
1(iv)
Answer
Factors affecting the movement of ocean water:
(i) Temperature
(ii) Earthquake or volcanic eruption
(iii) Gravitational pull of the sun and the moon
1(v)
Answer
The rhythmic rise and fall of ocean water twice in a day is called a tide.
The strong gravitational pull exerted by the sun and the moon on the surface of the earth causes the tides.
1(vi)
Answer
2(i)
Ocean water is salty.
Answer
Ocean water is salty because it contains large amount of dissolved salts. Most of the salt is sodium chloride or the common table salt that we eat.
2(ii)
Answer
The quality of water is deterioting because we get it from polluted water sources. These water bodies are getting polluted due to dumping of untreated wastes, sewage, pesticides, toxicor decayed materials into it.3(i)
(a) Water cycle
(b) Tides
(c) Ocean currents
Answer
3(ii)
(a) Poles
(b) Equator
(c) None of these
Answer
3(iii)
(a) Tide
(b) Ocean current
(c) Wave
Answer
✓ (a) Tide4
Match the following.
(i) Caspian Sea | (a) Largest lake |
(ii) Tide | (b) Periodic rise and fall of water |
(iii) Tsunami | (c) Strong seismic waves |
(iv) Ocean currents | (d) Streams of water moving along definite paths |
- | (e) Water cycle |
Answer
(i) Caspian Sea | (a) Largest lake |
(ii) Tide | (b) Periodic rise and fall of water |
(iii) Tsunami | (c) Strong seismic waves |
(iv) Ocean currents | (d) Streams of water moving along definite paths |