When an earthquake takes place, people say that it measured 6.2 or 6.5 on the scale. The scale they are referring to is the Richter Scale developed by Charles Richter in the 1930s.
The Richter Scale measures the magnitude of the seismic waves or vibrations that travels across the earth’s surface.
You get into an elevator (or a lift, as we sometimes call it) and for a second or two, just as the elevator moves down, we feel weightless. On the other hand, if we go up in an elevator, we suddenly feel heavier just as the elevator lurches upwards.
As a result of upheavals below its surface, the earth shakes now and then. This shaking of the earth is known as an earthquake.
Few natural events are as violently destructive as an earthquake. It usually strikes without warning, giving off violent vibrations in the process.
Where: Ahmedabad, Gujarat, India
February 5, 2001 : It was 8.45 am on January 26, 2001. A day when the country was celebrating Republic Day. Like their counterparts across India, the people of Ahmedabad, in the western state of Gujarat, were settling down to watch the Republic Day Parade on television.
When you go swimming in the river, you are told to be careful about the rocks, as you may bruise yourself if you hit against them.
But, fish swim in the water all the time. Through cracks and crevices in rocks inside the water, and between the branches of thorny water plants.
Where: Wellington, New Zealand
July 16, 2009 : A powerful 7.8-magnitude earthquake occurred in New Zealand’s South Island, near the city of Invercargill. No one was injured, nor was there any major damage. The region, South Westland, is almost uninhabited, and the quake was centred 35 kilometres under the sea off its coast.
In New York, people consume about 500 million kilowatt hours of energy per square kilometre every year. This is almost half of the total amount of solar energy (heat of the sun rays) falling on such an area in a year.
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