Dry
life
the land
random
water
100
a long period of time when little or no rain falls.
what is drought.
100
a change in life that suits new conditions.
what is adaption.
100
the removing or clearing away of trees from forests, and is often done to clear land for farming or ranching.
what is deforestation.
100
the pattern of weather over a long period of time.
what is climate.
100
the usually dry bed of a river or stream in a desert or semiarid area.
what is wadi.
200
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land that is not well suited for growing crops.
what is Marginal land.
200
a crop that is grown to be sold rather than to be consumed by the farmers and their families. 
what is cash crop.
200
a great deal of sand with tall sand dunes in the Sahara.
what is Erg.
200
ares defined by one or more natural or cultural characteristics that set it apart from other areas.
what is region.
200
moisture that falls from the sky as rain, snow, sleet, or hail.
what is precipitation.
300
a climate zone that is hot and dry all year with very little rain.
what is arid.
300
any action that relates to the making, buying, and selling of goods and services.
what is economic activities.
300
a large area with a certain type of scenery.
what is a landscape.
300
any natural characteristic of the Earth's surface, such as landforms and bodies of water. 
what is physical feature.
300
the wearing away of the earths surface over time by wind, water, ice, and gravity.
what is erosion.
400
the process of when a land becomes gradually dry until it turns into dessert. 
what is desertification.
400
the creation and use of tools to meet practical needs and also refers to the tools themself.
what is technology.
400
a high, rock-covered flatland in the Sahara.
what is hammada.
400
a gravel-covered desert plain. 
what is reg.
400
an isolated spot in the desert where water is found.
what is oasis.
500
a geographic region with too little rainfall to support plant life which is also a vegetation zone.
what is a desert.
500
the practice of clearing one area for farming for a few years and then moving on to another area when the first has lost its fertility.
what is shifting agriculture.
500
any natural feature of the Earth's surface that has a distinct shape.
what is a landform.
500
winds from tropical latitudes that blow toward the equator from the north and south.
what are trade winds.
500
groups of herders that move with their animals from place to place in search for pasture and water.
who are pastoral nomads.