The New Encyclopædia Britannica: L-ZEncyclopædia Britannica, 1992 - 32 pages |
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Page 38
... rocks . The oldest rocks are of Archean age ( more than 3.6 to 2.5 billion years old ) and are found in the so - called granite - gneiss - greenstone terrains of the Kaapvaal , Zim- babwe , and Congo cratons . They consist of gray ...
... rocks . The oldest rocks are of Archean age ( more than 3.6 to 2.5 billion years old ) and are found in the so - called granite - gneiss - greenstone terrains of the Kaapvaal , Zim- babwe , and Congo cratons . They consist of gray ...
Page 42
... rocks with substantial deposits of chromium , asbestos , and nickel . It is still not clear whether Archean evolution was characterized by the same plate tectonic processes that are seen today , and there are suggestions that the ...
... rocks with substantial deposits of chromium , asbestos , and nickel . It is still not clear whether Archean evolution was characterized by the same plate tectonic processes that are seen today , and there are suggestions that the ...
Page 68
... rocks are al- most impermeable except where fractured or weathered . Volcanic rock , especially the basalts , may yield up to 1,060 cubic feet per hour . Most of the exploited groundwater is generally fit for consumption because the ...
... rocks are al- most impermeable except where fractured or weathered . Volcanic rock , especially the basalts , may yield up to 1,060 cubic feet per hour . Most of the exploited groundwater is generally fit for consumption because the ...
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