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GS Geography Physical Geography of World
Q.

The line on a map connecting points of equal temperature at a given time is:
Explanation:

ANS. (D) 
An isotherm is a line that connects points on a map that have the same temperature. Therefore, all points through which an isotherm passes have the same or equal temperatures at the time indicated. Generally, isotherms representing 5 °C or 10 °F temperature differences are used, but any interval may be chosen.

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