What is the ph of H2SO4?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

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

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate