State the use of the lines of longitude in relation to distance and time.

Give a geographical reason for each of the following:
(i) Lines of longitude are called meridians of longitude.
(ii) Lines of longitude are of same length.
(iii) Diametrically opposite lines of longitude and the Equator are called Great Circles.

Draw a well labelled diagram showing the different heat zones of the world.

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.