Page 150 - SST Class 07

found where warm and cold currents meet. g Warm currents help in keeping the seaport
Thus, areas around Newfoundland and ice free and thus help it to remain open
Japan are rich in fish. throughout the year, even in higher lati-

g Ocean currents help in navigation. A ship tudes.
sailing along a current will go faster, thus g Warm currents reduce the danger of ice-
saving time and fuel. bergs for the sailing ships.

Terminology

Scarce : insufficient for the demand
Devastation : great destruction or damage
Rehabilitation : the action of restoring someone to health or normal life through training and therapy after
imprisonment, addiction or illness
Navigation : the process or activity of accurately ascertaining one’s position and planning and following
a route

Inside Story
Inside Story
g Water is one of the five elements which form the ‘Panchatatva’.
g Rain puddles are formed in the rainy season.
g The heat of the sun evaporates water which changes its form and becomes water vapour.
g Cutting down of trees, polluting water bodies and wasting water can affect the water cycle.
g Freshwater is a small fraction of total water on the earth.

g 71% of the earth’s surface is covered with water while only 29% is the land area.
g The height of tides depends upon the relative position of the moon and the sun with respect
to the earth.

A. Tick (3) the correct option.
1. The amount of available freshwater on the earth is :

(a) 1% (b) 2.5% (c) 3%
2. The main cause for ocean currents is :
(a) gravitation (b) rotation of the earth (c) wind

3. The main cause for the occurrence of tides is :
(a) wave movement (b) gravitational pull (c) planetary winds
4. Warm ocean currents originate from :

(a) poles (b) equator (c) tropics
5. Water is ________________ resource.

(a) renewable (b) recyclable (c) both (a) and (b)

Social Science-7 150