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Rocks of this system occur in a large area from the Orange River to Botswana,
where they rest upon the eroded surface of rocks of the Ventersdorp System and
underlie the Matsap Beds. The Transvaal System was probably deposited in a ...
Twinning often occurs from the beginning of crystal growth. ... in classes with a
centre of symmetry will have a twinning axis perpendicular to a twinning plane,
but, lacking a centre of symmetry, a twinning axis or plane may occur
Airstreams are often deep enough to flow directly over a mountain range; these
sometimes form strong vertical currents the speed of which commonly reaches 5
metres (16 feet) per second. The first wave occurs above the mountain that ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review