Lab report on cells, please 3 paragraphs worth 30 points

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

Why is the melting of ice a physical change ?

Which three statements represent the benefits of performing experiments using computer simulations?