Basin
a natural depression on the earth's surface, typically containing water.
Aquifer
a body of permeable rock that can contain or transmit groundwater.
Canopy
an ornamental cloth covering hung or held up over something,
especially a throne or bed.
Berlin Conference
regulated European colonization and trade in Africa during the New
Imperialism period
Pandemic
(of a disease) prevalent over a whole country or the world.synonyms:
Rai
a style of music fusing Arabic and Algerian folk elements with
Western rock.
Ashanti
a member of a people of south central Ghana.
Commodity
a raw material or primary agricultural product that can be bought and
sold, such as copper or coffee.
AIDS
a disease in which there is a severe loss of the body's cellular
immunity, greatly lowering the resistance to infection and malignancy.
Malaria
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.
Escarpment
a long, steep slope, especially one at the edge of a plateau or
separating areas of land at different heights.
Oasis
a fertile spot in a desert where water is found.synonyms:
Desertification
the process by which fertile land becomes desert, typically as a
result of drought, deforestation, or inappropriate agriculture.
Cash crop
a crop produced for its commercial value rather than for use by the grower.
Masai
a member of a pastoral people living in Tanzania and Kenya.
Stateless Society
a society that is not governed by a state, or, especially in common
American English, has no government.
Apartheid
(in South Africa) a policy or system of segregation or discrimination
on grounds of race.
Diversify
make or become more diverse or varied.
Cholera
an infectious and often fatal bacterial disease of the small
intestine, typically contracted from infected water supplies and
causing severe vomiting and diarrhea.
Tuberculosis
an infectious bacterial disease characterized by the growth of
nodules (tubercles) in the tissues, especially the lungs.