(a) (i) With the aid of a diagram, identify the main lines of latitude. (ii) Calculate the distance between Addis Ababa in Ethiopia (latitude 10°N) and Mase...

(a) (i) With the aid of a diagram, identify the main lines of latitude.
(ii) Calculate the distance between Addis Ababa in Ethiopia (latitude 10°N) and Maseru in Lesotho (latitude 30°S).

(b) (i) Define revolution of the earth.
(ii) Describe how revolution of the earth affects the length of day and night in the Northern Hemisphere.