Migration

• going from one place, region to another.

Interdependence

• dependence between two or more people, groups, or things.

Production 

• creation of rule or wealth by producing goods and services.

Composistion

• the purchase/ or use of goods and services.

Aquifer

• an underground layer of rock and soil that contains water.

Oasis

• a place where fresh water is avalible from an underground spring or well.

Wadis

• waterway that fills up in the rainy season but are dry in the rest of the year.

Arable Land

• land that is capable of producing crops