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EARTH PILLAR

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Originally appearing in Volume V08, Page 817 of the 1911 Encyclopedia Britannica.
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See also:

EARTH See also:PILLAR , a pillar of soft See also:rock, or earth, capped by some harder material that has protected it from denudation. The " See also:bad lands " of western See also:North See also:America furnish numerous examples. Here " the formations are often beds of See also:sandstone or shale alternating with unindurated beds of See also:clay. A semi-arid See also:climate where the precipitation is much concentrated seems to be most favourable to the development of this type of formation." The See also:country See also:round the Dead See also:Sea, where loose friable sandy clay is capped by harder rock, produces " bad-See also:land " See also:topography. The cap of hard rock gives way at the See also:joints, and the See also:water making its way downwards washes away the softer material directly under the cracks, which become wider, leaving isolated columns of clay capped with hard sandstone or See also:limestone. These become smaller and fewer as denudation proceeds, the pillars See also:standing a See also:great height at times, until finally they all disappear.

End of Article: EARTH PILLAR

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