Why is slate used for roofing shingles?

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

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

At element makes up all organic compounds?