a natural depression on the earth's surface, typically containing water.
a body of permeable rock that can contain or transmit groundwater.
a rooflike projection or shelter.
The Berlin Conference of 1884–85, also known as the Congo Conference (German: Kongokonferenz) or West Africa Conference (Westafrika-Konferenz), regulated European colonization and trade in Africa during the New Imperialism period, and coincided with Germany's sudden emergence as an imperial power.
(of a disease) prevalent over a whole country or the world.
a style of music fusing Arabic and Algerian folk elements with Western rock.
a member of a people of south central Ghana.
a raw material or primary agricultural product that can be bought and sold, such as copper or coffee.
a disease in which there is a severe loss of the body's cellular immunity, greatly lowering the resistance to infection and malignancy.
an intermittent and remittent fever caused by a protozoan parasite that invades the red blood cells. The parasite is transmitted by mosquitoes in many tropical and subtropical regions.
a long, steep slope, especially one at the edge of a plateau or separating areas of land at different heights.
a fertile spot in a desert where water is found.
the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
a crop produced for its commercial value rather than for use by the grower.
a member of a pastoral people living in Tanzania and Kenya.
a society that is not governed by a state, or, especially in common American English, has no government.
(in South Africa) a policy or system of segregation or discrimination
on grounds of race.
segregation on grounds other than race.
make or become more diverse or varied.
an infectious and often fatal bacterial disease of the small intestine, typically contracted from infected water supplies and causing severe vomiting and diarrhea.
an infectious bacterial disease characterized by the growth of nodules (tubercles) in the tissues, especially the lungs.