C. calculate precise volumes of all prismoids.<span>The general prismoidal formula can be used to calculate the volume of any prismodal.
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<span>A mantle plume is an upwelling of abnormally hot rock within the Earth's mantle. As the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.
Found this on ScienceDaily.com</span><span>
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Explanation:
disavantage
many diseases are caused due to spread of mosquitoes, worms and insects on account of stationary water in canals.
advantage
economic development can be expedited by avoiding dangerous droughts. depending on rainfall can be minimized through canal development.