i. Arid climates : Arid or desert type of climate has driest climate variety in sub-tropical belt between 20° and 30° north and south latitudes. This type of climate is found in Peru and Chile in South America, Kalahari desert in Africa, Australia desert, Sahara and Arabian and Thar desert of India-and Pakistan and deserts of North Mexico. Annual rainfall is low.
ii. Semi-arid or Steppe type of climate: It has an annual rainfall range of 30 to 60 cm. These areas are in the heart of the grassland of western North America and Eurasia. That is why they are called steppe type of climate. It is found in tropical deserts from Morocco to Tunisia and from Dakkar in Senegal to Ethiopia and deserts of Afghanistan.
