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प्रश्न
Describe how earthquakes are caused on the surface of the earth.
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उत्तर
Earthquakes are caused by the sudden release of energy stored in the Earth’s crust due to stress and strain. When the crust is unable to accommodate the stress, it results in a sudden release of energy in the form of shock waves, causing an earthquake. These shocks can occur due to several factors, such as the movement of tectonic plates and volcanic eruptions, and isostatic imbalances caused by diastrophism, which leads to the formation of faults or folds and creates upheavals and depressions on the Earth’s surface.
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संबंधित प्रश्न
Fill in the blank:
The last of the earthquake waves to arrive on the surface of the earth are ___________ waves.
Fill in the blank:
About 70 percent of the earthquakes occur in the _________________ Belt.
Name two man-made causes of an earthquake.
What are known as seismic focus and epicenter with respect to an earthquake?
How are earthquakes useful?
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. |
Explain the three types of earthquake waves.
What is an Earthquake?
Name the important Earthquake-belts of the world.
OR
Indicate two major belts of Earthquakes.
Name some Earthquakes which caused great damage.
Describe the main type of Earthquake Waves.
Name three causes of Earthquakes.
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.
Define Earthquake.
On an outline map of the world, mark the Pacific Ring of Fire
In India, the Himalayan region and the ______ valley are prone to earthquakes.
What is the point of the earth’s surface directly above the focus called?
Choose the odd one.
focus, epicenter, vent, seismic waves
