Which phase change in an example of an exothermic process?
a solid to liquid
b solid to gas
c liquid to solid
d liquid to gas
e solid to plasma

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