What might democritus think about the modern model of the atom? does it match his theory of the indivisibility of 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

Chemistry worksheet - i am not sure what they are asking for exactly?

How many atoms or molecules are there in a mole of a substance?