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ice jam |
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ice jam [′īs ‚jam] (hydrology) An accumulation of broken river ice caught in a narrow channel, frequently producing local floods during a spring breakup. Fields of lake or sea ice thawed loose from the shores in early spring, and blown against the shore, sometimes exerting great pressure. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Curious, Manny climbs up this ice dam and peeks over the wall. Basically the position of the ice dam is recognized from two observations: the presence of one or more major terminal moraines deposited when there was a hiatus during the period of ice recession, and the disappearance (or weakening) of beaches as the ice barrier is approached (so that beaches are found only on the sides of the basin where the ice barrier was absent). Large spring floods during the ice age could also have resulted when meltwater built up behind ice dams and forced them to burst, says Richard B. |
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