A certain crystalline substance that has a low melting point does not conduct electricity in solution or when melted. This substance is likely to be a covalent network solid A a metallic solid B a polymer C an ionic solid D a molecular solid

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering