(a) Highlight any three effects of either rotation or revolution of the earth

(b) Give reasons why:
(i) all areas north of the Arctic Circle have twenty four hours of daylight on June 21
(ii) areas within the tropics have more sunshine than areas outside the tropics
 

 (a) Using appropriate diagrams, explain the process of formation of a
(i) river capture
(ii) waterfall

(b) Describe one way in which each of the two features above is useful to man