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It happens because the consuming is higher than the water drop rate, or even because there are too many people in a zone where there is not enough fresh water.
Answer:
Pioneers moved west through a desire to make their fortune through the farming of previously unfarmed lands – too many people it was regarded as an extremely exciting opportunity, a chance of a new life. -The attraction of cattle farming encouraged people to move out west.
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The Sahel is the ecoclimatic and biogeographic zone of transition in Africa between the Sahara to the north and the Sudanian Savanna to the south. Having a semi-arid climate, it stretches across the south-central latitudes of Northern Africa between the Atlantic Ocean and the Red Sea. Wikipedia
Area: 1.179 million mi²
The Sahel has a tropical, hot steppe climate (Köppen climate classification BSh). The climate is typically hot, sunny, dry and somewhat windy all year long. The Sahel's climate is similar to, but less extreme than, the climate of the Sahara desert located just to the north.
Explanation:
Maybe post the picture to your problem if you need help
Answer:
advantage
* The scale is essential consant;
*Some objects not visiable on vertical photos may be seen in obiliqe.
disadvantage
*it lacks marginal .
*it requires more training to interpert than a map.