Why was it difficult for dalton to prove his theory?
a.
people did not believe that solids could be made of small particles
c.
only very powerful, expensive microscopes could be used in his experiments
b.
atoms are too small to see
d.
he could not keep atoms in a stable form

the answer is b because atoms are to small to see

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.