ANSWER IS:( A PHYSICAL CHANGE INVOLVING CHANGE OF SHAPE AMD SIZE OF MATTER)Mrs. Clark decides to do a demonstration for her class with a piece of notebook paper. Using a balance, Mrs. Clark discovers that the mass of the paper is 20 g. She then takes the piece of paper and cuts it into several small pieces. The cumulative mass of the small pieces is 20 g. What has Mrs. Clark demonstrated for her class? A.
a physical change involving change of mass
B.
a physical change involving change of shape and size of matter
C.
a chemical change involving change of shape and size of matter
D.
a chemical change involving change of mass

physical change involving change of shape and size of matter

Explanation:

The chemical makeup didnt change, it's still paper, just smaller pieces. The physical change here is the same as if you cut your hair, the hair is still hair, you just have a little less on your head and the rest is in your hand.

force tends to be low and long diustance masses are high

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.