When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a . pls help ASAP!​

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