Topic : Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc., geographical features and their location-changes in critical geographical features (including water-bodies and ice-caps) and in flora and fauna and the effects of such changes.
1. Differentiate between tropical and extra-tropical cyclones. (250 words)
Reference: World physical geography by Savindra Singh/ G C Leong ,The Hindu Business Line
Why the question:
From Sri Lanka, cyclone ‘Burevi’ to head for South TN coast, thus the context of the question.
Key Demand of the question:
The question is straightforward and one must differentiate between tropical and extra-tropical cyclones.
Directive:
Differentiate – provide for a detailed comparison of the two types, their features that are similar as well as different. One must provide for detailed assessment of the two.
Structure of the answer:
Introduction:
Start with basic definition of cyclones introducing the two cyclones.
Body:
The atmospheric disturbances which involve a closed circulation about a low pressure centre, anticlockwise in the northern atmosphere and clockwise in the southern hemisphere, are called cyclones.
They fall into the following two broad categories: (a) Extra-tropical and (b) tropical cyclones.
Differentiate between the two on the basis of various parameters like origin, size etc.
Conclusion:
Conclude with recent examples.
