Which characteristic best explains the difference in melting behavior of covalent substances and ionic substances?
ionic substances have weaker intermolecular attractions.
ionic substances usually have stronger atomic bonds.
covalent substances have weaker intermolecular attractions.
covalent substances usually have stronger atomic bonds.

C

Explanation:

the answer would be a

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.