Page 112 - SST Class 07

2. The Ring of Fire runs along the ______________ Ocean.
(a) Atlantic (b) Pacific (c) none of these

3. ______________ volcanoes erupt rarely.
(a) active (b) extinct (c) dormant
4. The place where an earthquake originates is called ______________ .

(a) focus (b) epicentre (c) seismograph
5. The Richter Scale was invented by ______________ .
(a) Charles Simon (b) Charles Richter (c) Charles Babbage

6. When tectonic plates compress against each other, ______________ occurs.
(a) anticlines (b) faulting (c) folding
7. An up-fold is called ______________ .

(a) anticline (b) syncline (c) faulting
8. Synclines result in ______________ .
(a) valleys (b) mountains (c) glaciers

B. Match the following :
1. Tectonic movement u u Wearing away for the earth’s surface by the action of wind,
rain or ice.
2. Seismograph u u Change occuring due to the effect of sun, rain or wind.

3. Focus u u The place just above the focus.
4. Epicentre u u The movement of tectonic plates in the earth’s interior.

5. Weathering u u An instrument to measure the magnitude of an earthquake.
6. Erosion u u The place where an earthquake originates.
C. Fill in the blanks :

1. Changes in the earth are called _____________ .
2. Most volcanoes occur along the _____________ .

3. The place where vibrations originate in the earth’s interior is called _____________ .
4. The epicentre of the earthquake on 25 April, 2015 was located at _____________ .
5. The collision of plates results in up-folds and down-folds called _____________ and _____________
respectively.
6. Tectonic movements can be _____________ or _____________ .

D. Answer in one word or phrase :
1. What forces work in the earth’s interior?

2. What type of volcanoes rarely erupt?
3. What is the name of the point above the focus?
4. Who invented the Richter scale?

5. When did the earthquake in Nepal occur?
6. What are the up-folds and down-folds called?
Contemporary Social Science-7
112