a natural depression on the earth's surface, typically containing water.
a body of permeable rock that can contain or transmit groundwater.
the uppermost trees or branches of the trees in a forest, forming a more or less continuous layer of foliage.
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 member of a people of south central Ghana.
a style of music fusing Arabic and Algerian folk elements with Western rock.
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.
Desertification is a type of land degradation in which a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as climate change and human activities.
The term cash crop is applied exclusively to the agricultural production of plants; animal agriculture is not a part of the terminology. The term is used to differentiate marketed crops from subsistence crops, which are those fed to the producer's own livestock or grown as food for the producer's family.
a member of a pastoral people living in Tanzania and Kenya.
A stateless society is 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
an infectious and often fatal bacterial disease of the small intestine, typically contracted from infected water supplies and causing severe vomiting and diarrhea.
make or become more diverse or varied.
A potentially serious infectious bacterial disease that mainly affects the lungs