Given the fact that the molecular weight of water vapor is less than that of dry air, what affect does increasing humidity have on the density of the atmosphere? Does this run counter to what your intuition tells you?

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