The excess of heat received in equatorial regions expands the water, but at the same time excess of evaporation concentrates it, so that the density increases. [Please select]
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As the lye concentrates the gravity gradually rises to 28°-30° B. [Please select]
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--Showing how a burning-glass concentrates the heat rays which fall upon it. [Please select]
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The textile industry employs the greatest number of operatives, or at least concentrates them more. [Please select]
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