Page 134 - SST Class 07

3. Do not run outside blindly, you may get and power lines. Stay inside the vehicle and
killed by falling bricks and debris just out- wait for the shaking to stop.
side the buildings. You should not use lifts 5. Do not rush to the roof of the house. Never
during an earthquake. enter a cracked or partially damaged house.

4. If you are in a moving vehicle, ask the driver The slightest movement may lead to its
to take the vehicle to a side of the road. collapse.
Keep away from the bridges, trees, buildings
Terminology

Thermosphere : the region of the atmosphere above the mesosphere
Explosive : able or likely to shatter violently or burst apart
Effusive : showing or expressing gratitude, pleasure or approval in an unrestrained or heartfelt
manner
Epicenter : the point on the earth’s surface vertically above the focus of an earthquake

Inside Story
Inside Story
g About 71 percent of the earth’s surface is covered with water and the rest 29 percent is
land.
g The earth’s crust consists of plates, known as lithospheric or tectonic plates.
g The forces which originate on the surface of the earth are called exogenic forces.
g Silica is a mineral found in nature as sand or quartz.
g Active volcanoes erupt frequently and throw out lava, gases, ashes and rocks.

g The place in the crust where the movement starts is called the focus.
g The earthquake tremors are recorded by an instrument called seismograph.

A. Tick (3) the correct option.

1. How much fresh water is present on the earth?
(a) 2.5% (b) 3% (c) 3.5%

2. The forces which originate from within the earth are called:
(a) endogenic forces (b) exogenic forces (c) both (a) & (b)
3. It erupts frequently and throw out lava, gases, ashes and rocks.
(a) Active volcano (b) Dormant volcano (c) None of these

4. Which of the following is not an active volcano?
(a) Stromboli (b) Etna (c) Rainier

5. Which of the following terms is not linked with seismic activity?
(a) Epicenter (b) Focus (c) Richter Scale

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