The New Encyclopaedia Britannica, Volume 29Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 247
... exposure to ultraviolet . The degree of pig- mentation is directly related to the length of ultraviolet exposure and the body's inherent ability to produce pigments . Tanning is a natural body defense to help protect the skin from ...
... exposure to ultraviolet . The degree of pig- mentation is directly related to the length of ultraviolet exposure and the body's inherent ability to produce pigments . Tanning is a natural body defense to help protect the skin from ...
Page 416
... exposure . Vibrations with frequencies of less than two cycles per second are encountered mainly in low - altitude aircraft . Motion sickness , dizzi- ness , nausea , and vomiting are experienced . Persons exposed to vibrations of one ...
... exposure . Vibrations with frequencies of less than two cycles per second are encountered mainly in low - altitude aircraft . Motion sickness , dizzi- ness , nausea , and vomiting are experienced . Persons exposed to vibrations of one ...
Page 476
... exposed ) or dark blue ( after long exposure ) , glassy crystals in the weathered zones of phosphate deposits and as concretions in clays ( widespread ) . It also occurs in recent sediments , in lignite and peat , in forest soils , and ...
... exposed ) or dark blue ( after long exposure ) , glassy crystals in the weathered zones of phosphate deposits and as concretions in clays ( widespread ) . It also occurs in recent sediments , in lignite and peat , in forest soils , and ...
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