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Question
Give two major causes of earthquakes.
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Solution
Two major causes of earthquakes are faulting associated with tectonic forces and the movements due to volcanic eruptions.
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Most earthquakes occur on account of the strain in the _________.
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The last of the earthquake waves to arrive on the surface of the earth are ___________ waves.
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The giant sea waves caused by earthquakes in the oceans are called ___________.
What are known as seismic focus and epicenter with respect to an earthquake?
Match the Columns.
| Column A | Column B |
| 1. Tsunami | (a) The waves that make the inhabitants feel the ground motion. |
| 2. Seismograph | (b) The instrument for measuring the intensity of earthquakes. |
| 3. S-waves | (c) Harbour waves generated by oceanic earthquakes. |
| 4. Richter scale | (d) The point on the earth surface directly above the seismic focus. |
| 5. Epicentre | (e) An instrument for recording the movement of earthquake waves. |
What is the difference between seismic focus and epicenter?
How are earthquakes distributed over the globe?
How is the intensity of an earthquake measured?
What is an Earthquake?
Name the important Earthquake-belts of the world.
OR
Indicate two major belts of Earthquakes.
Describe the main type of Earthquake Waves.
Give one word for the following :
The surface position immediately above the origin of an earthquake.
Give reasons for the following:
Internal processes are different from external processes.
Give reasons for the following:
Folding and faulting frequently go together.
Choose the odd one
What is Seismograph?
Give a note on Tsunami 2004.
Name the point where the vibrations originate in an earthquake.
Choose the odd one.
focus, epicenter, vent, seismic waves
