How did the work of dmitri mendeleev differ from that of john newlands in the development of the periodic table?

a. mendeleev arranged the elements according to increasing atomic mass.
b. mendeleev predicted elements that would later be discovered.
c. mendeleev identified elements that had similar properties.
d. mendeleev organized elements into triads based on their properties.

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.