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| Q. |
What is a 'tornado'? |
| A. | A very high pressure centre |
| B. | A very low pressure centre |
| C. | A very high ocean wave |
| D. | A planetary wind |
| Answer» B. A very low pressure centre | |
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Explanation: A tornado is a closed low pressure circulation which is marked by a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. Low-pressure systems form under areas of wind divergence which occur in upper levels of the troposphere. The formation process of a low-pressure area is known as cyclogenesis. |
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