Some US scientists have formulated an equation to help predict the occurence of ice shelf break ups. The ice shelf is part of a glacier that extends beyond the edge of the continent out unto the ocean. Once the shelf reaches a certain size pieces will begin to break off and become ice-bergs, this is called calving. The rate at which calving occurs the US scientists say is determined mainly by the rate of glacier spreading, as well as the width of the ice shelf, with narrower shelves calving less often than wider ones. According to scientists, if the ice covering Greenland and Antarctica melted global sea levels would rise by 200 feet.
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