CASE STUDY: The throat for the Sahel Sahel is an Arabic word that means "coastline, The Sahel is the senu dry transition zone between the Sahara dlesen and Africa's tropical grassland and savanna. It is a region that is 1000km wide and atretch over 4000km from Sewu unt Sudan (Some scientists inchado Eritrea as part of the Sahel ) MAURITANIA MAIL ALGERIA Dry land systern Statthay LOUD NIGERIA CENTRAL AFRICAN REPU YAMERDEN cm/month Map of the Sahel in North Africa The climate in the Sahul region to dry for at fast oight months of the year, with a short rainy season between June and August. The rainfall la 200-400mm per year, but it is unpredictable. Droogles occur twice in every five years in this region Sevaral inhabitanto lo semi-nomadic they plant crops, but they also move around in search of pasturage lor their animals 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 3.1.1 Define the following terms: a) b) Desertification Drought (2x2)( 3.1.2 Use the information in the text and call one physical and one human factor threaten the Sahel. (2x1)(2 3.1.3 Use data rainfall index data and briefly explain the rainfall situation from 1970 to 2010. (2x2) 3.1.4 Explain TWO negative economic effects of droughts. (2x2) TOTAL: 6​