March 13, 2014

10th Social New Syllabus - Land Water Relationship

Land water relationship: Look at map of India showing land cover and water bodies, and you will see another important factor which has an influence on climate: the land and water relationship . The amount of sunlight that is first absorbed and then radiated back or directly reflected depends on the nature of the surface. Darker areas, such as heavily vegetated regions, tend to be good absorbers; lighter areas, such as snow and ice-covered regions, tend to be good reflectors. The ocean absorbs and loses heat more slowly than land. This affects climate in many ways. One of this is the formation of land and sea breeze. From the illustration below explain how this happens.

How does this ‘moderate’ the temperature of such a place?

A large part of southern India, because of its long coast line, comes under the moderating influence of the sea. As such, the difference between the temperature of day and night and also that of summer and winter is not much. This is known as equable climate. However, if we compare similar places on the same latitude and not high up in the mountains we could appreciate the effect of the sea.

- In your atlas, compare the temperatures of Mumbai and Nagpur for winter and summer
months. How are they similar or different? How does it explain distance from the sea?

- With the help of the climographs can you explain how differences in temperature can be
explained for Jaipur and Chennai.

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