The New Encyclopędia Britannica: L-ZEncyclopędia Britannica, 1992 - 32 pages |
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Page 48
... SOILS Soil types . In general , soil types on the African con- tinent may be divided into five or six broad categories . There are desert soils ; chestnut - brown soils , which border the deserts ; and chernozem - like soils ( dark black ...
... SOILS Soil types . In general , soil types on the African con- tinent may be divided into five or six broad categories . There are desert soils ; chestnut - brown soils , which border the deserts ; and chernozem - like soils ( dark black ...
Page 49
... soils to develop , since the land , except in the val- ley bottoms , is not sufficiently flat over wide enough areas to allow the soil - forming ( parent ) materials to remain in place and thus to be thoroughly weathered . Soil problems .
... soils to develop , since the land , except in the val- ley bottoms , is not sufficiently flat over wide enough areas to allow the soil - forming ( parent ) materials to remain in place and thus to be thoroughly weathered . Soil problems .
Page 169
... Soil and water sciences . Soil and water sciences deal with the geological generation of soil , soil and water physics and chemistry , and all other factors relevant to soil fertility . Soil science began with the formulation of the ...
... Soil and water sciences . Soil and water sciences deal with the geological generation of soil , soil and water physics and chemistry , and all other factors relevant to soil fertility . Soil science began with the formulation of the ...
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20th century Abelian group addition aesthetic Afghanistan agriculture Albania alcohol algae algebra animals basin called central centre ceremonial climate coast common complex numbers Congo contains Cōte d'Ivoire countries crops cultivation culture dance defined desert developed drinking drug East eastern economic Egypt elements equations European example farm feet field Figure finite fish forest functor Igbo important Indians integers irrigation isomorphism Kabul Kenya Lake Lake Chad Lake Victoria land language lattice Lie algebra linear major mapping miles modern mountains Niger Nigeria Nile northern operations patterns percent period Plains plants Plateau polynomial population rainfall real numbers region ring ritual River Sahara savanna social soil South Africa southern Africa species subgroup Sudan Tanzania theory tion traditional tribes tropical United valley vector space vegetation village West Africa western x₁ Yoruba Zaire Zambia Zimbabwe