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Two views have been expressed on the origin of these salt structures . Some believe that the structures are due to gravitational forces alone , whereas others claim that the structures owe their characteristics , position , and ...
... stable to permit beach abrasion and chemical weathering to remove rock fragments and feldspars . Apparently this was the origin of the Tuscarora Quartzite ( Silurian ) of the Appalachians . Arkosic sandstones are of two types .
In each case , great explosions of unknown origin that devastated large , forested areas occurred . The arrival of meteors and meteorites is less rare , but a few records of damage to houses or persons due to the fall of meteorites are ...
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LibraryThing ReviewUser Review - keylawk - LibraryThing
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