Can someone please help its science

In which phase(s) do the molecules take the shape of the container?

What is the mass of 0.46 mil of mgcl2

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