According to the scheme outlined the hot lands (roughly lying between 30 degree N and 30 degree S) can be divided into four natural regions,
(1) Hot deserts, Sahara type.
(2) savana grasslands,Sudan type.
(3)hot east coast :-
(a) Monsoon areas, Indian type
(b) Trade wind areas,Caribbean type.
(4) Equatorial areas, Amason type.
HOT DESERTS
Climate
Hot deserts are found on the margins of land masses, and lie, approximately,between latitudes 20 degree to 30degree The controlling factors in the climate of these regions are the high pressure belt (Horse Latitudes) and the drying trade winds. Blowing off shore . Thus rainfall is deficient, always under 10 in. annually , and in some places rain only falls once in five or six years . When rain does fall showers are often torrential. The average annual rainfall of Iquique in South America, for instance is 0.03 in. The coasts of all hot deserts are washed by cold currents flowing towards the equator. These reduce both the temperature and the rainfall because the sky is almost cloudless, night temperatures are very low,I.e the diurnal range of temperatures is large.