Give a geographical reason for each of the following:
(i) Lines of latitude are called parallels of latitude.
(ii) Lines of latitude are not of equal length.
(iii) Lines of latitude carve out the heat zones of the earth.

(i) Lines of latitude are called parallels of latitude as these lines are parallel to the Equator and each other.

(ii) Lines of latitude are not of equal length as they become smaller as we move towards the poles.

(iii) Lines of latitude carve out the heat zones of the earth as the temperature goes on decreasing from the equator towards the poles. Thus, these lines indicate the general climate of an area by applying the principle of heat zones.