yard. Unit of length equal to 0.91 meters. ihn year-class. A method of defining cohorts w t i a population based upon the year that they were born or were spawned. year-class strength. Term that refers to the size of a cohort in a population relative to older and younger cohorts. See cohort. yellowcake. Name given to a mixture of uranium that is used as a fuel in nuclear reactors. yellow fever. A life-threatening disease caused by a virus transmitted by mosquitoes. younger dryas. A period of sudden cold temperatures in the northern hemisphere that began about 10,000 to 11,000 years ago and which occurred after the end of the last ice age. A hypothesis is that the sudden cooling may have arisen from the rapid melting of Greenland glaciers which, in turn, created a cold mass of water that diverted the Gulf Stream from the North Atlantic. 307 This page intentionally left blank
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