What are two features used to describe matter

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

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n