The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 182
... Sahara , and South West Africa / Namibia . In Egypt and Arabia their presence has been revealed by drilling . Elsewhere they remain unknown . During the Ordovician Period ( from 500,000,000 to 430,000,000 years ago ) fossiliferous ...
... Sahara , and South West Africa / Namibia . In Egypt and Arabia their presence has been revealed by drilling . Elsewhere they remain unknown . During the Ordovician Period ( from 500,000,000 to 430,000,000 years ago ) fossiliferous ...
Page 185
... Sahara and the Kalahari , a process which began about 3000 BC . PRESENT GEOLOGICAL STRUCTURES AND RELIEF Africa represents a magnificent example of the relation of geological structure to relief . In the north the chains of the Atlas ...
... Sahara and the Kalahari , a process which began about 3000 BC . PRESENT GEOLOGICAL STRUCTURES AND RELIEF Africa represents a magnificent example of the relation of geological structure to relief . In the north the chains of the Atlas ...
Page 282
... Sahara , eastern and southern Africa , and else- where from about 5500 to 2500 BC , with the latter part of the period marked by extensive rock paintings such as at the Tassili site in the Sahara . In the West African for- ests ...
... Sahara , eastern and southern Africa , and else- where from about 5500 to 2500 BC , with the latter part of the period marked by extensive rock paintings such as at the Tassili site in the Sahara . In the West African for- ests ...
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accelerator acid activity Adams administrative advertising Aeschylus aesthetic Africa agriculture animals appear become body called Central century changes contains continued cost countries crops cultural dance early East effect electrons elements engineering established example farm feet field figures flight followed function human important increase industry influence Italy Khoisan Knossos known Lake land languages later less living major materials means ment natural occur operations organization original patterns percent performance period plants play political population present production range region remains represented result River society sound South southern species structure style theory tion traditional United usually variety West Western widely