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arid
dry
unequal distribution of water
when some parts of a region have rivers and lakes while others do not

drought
when an area goes without rain for a long period of time

irrigation
when water is brought to farmers' fields by pipes, ditches, sprinklers, etc.

agriculture
farming crops for food

subsistence farming
raising just enough crops to support your family; not for sale

overgraze
problem occurring when grazing animals like cows and sheep eat too much of the vegetation in a dry area

deforestation
cutting down trees and other vegetation

slash and burn agriculture
cutting down the vegetation on a plot of land, setting fire to the this vegetation, and using the ashes to provide nutrients to the soil when planting food crops

poor soil
soil that doesn't have enough nutrients to grow plants

desertification
the formation and expansion of desert

sewage
human or animal waste

overpopulation
too many people in an area

water pollution
when water is dirty from parasites, sewage, garbage, or chemicals

parasites
Any kind of living thing that lives on or in another living thing. It gets its food from inside the other living thing. It sometimes hurts the other living thing.

waterborne diseases
diseases we can catch from the water

Green line of Demarcation
The place where the cultivated land ends and dessert begins
Oasis
small place where trees are able to grow and people can live with grazing animals as a few crops
Nomads
A member of a people who have no permanent home and travel from place to place to find fresh pasture and water for their livestock and example is the Tuareg people
Infrastructure
The basic physical systems of a country's population, including healthcare, roads, utilities, water and sewage