ICSE class 9 Geography Chapter Earthquake
i) Which type of plate experience moderate earthquakes.
ii) What are the main features of Primary waves?
iii) Which human activities can cause earthquake?
iv) Name the main earthquake belts in the world.
v) What are the factors on which the intensity of Earthquake depend?
vi) What is the role of plate tectonics in the occurrence of the earthquake?
vii) Compare the characteristics of primary and secondary seismic waves.
Viii) Describe the Mid-continental earthquake belt in the world.
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Answers
Answer:
i.Moderate earthquake are caused near divergent plate boundaries give reasons.
ii.Both Body Waves and Surfaces waves comprise an earthquake, but the body waves arrive first. Primary are first, And Secondary are, well, second of course. P Waves are compressional which means they move through (compress) a solid or liquid by pushing or pulling similar to the way sound travels through the air.
iii.Mining, dam building, and fracking are among the causes.
And while we've long known that people can influence seismic activity, researchers were surprised to find that human activity has induced earthquakes with magnitudes as high as 7.9—and that the number of earthquakes is clearly rising in some regions of the world
iv.The world's greatest earthquake belt, the circum-Pacific seismic belt, is found along the rim of the Pacific Ocean, where about 81 percent of our planet's largest earthquakes occur
Explanation:
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