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The Earth's Shifting Crust by Charles Hapgood - wire of information

The Earth's Shifting Crust by Charles Hapgood - wire of information

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GLOSSARY 395<br />

suit from the adaptation <strong>of</strong> an original stock to the new environ-<br />

mental opportunities for living space.<br />

SIAL: Silicon-aluminum rocks.<br />

SIMA: Silicon-magnesium rocks.<br />

STRANDLINE: A line marking a fossil seashore.<br />

STRATIGRAPHIC: Pertaining to the arrangement <strong>of</strong> rock strata.<br />

TECTONIC: Pertaining to rock structures resulting from deformation<br />

<strong>of</strong> the crust.<br />

TURBIDITY CURRENTS: Submarine currents caused <strong>by</strong> slumping<br />

<strong>of</strong> deposits along continental margins. <strong>The</strong>se currents carry sediments<br />

with them.<br />

UNCOMPENSATED WEIGHT: <strong>The</strong> weight <strong>of</strong> a crustal formation not<br />

isostatically adjusted. It thus constitutes a positive anomaly (q.v.).<br />

UNIAXIAL: <strong>The</strong> condition <strong>of</strong> having only one axis, as a sphere.<br />

VARVES: Annual deposits <strong>of</strong> sediment. <strong>The</strong>se can be counted to determine<br />

annual shorelines <strong>of</strong> old lakes.<br />

VIRENZPERIOD: A period in the history <strong>of</strong> a life form in which it ex-<br />

periences an explosive evolution and proliferation.<br />

VISCOSITY: <strong>The</strong> quality <strong>of</strong> being able to yield to stress or <strong>of</strong> being<br />

able to flow; the measure <strong>of</strong> such a property.

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