Dylan is trying to lift his bike into the back of his pick-up truck of height h. He attaches a light string to it and pulls it vertically upward. If the bike is the system, what kind of work do Dylan and Earth do on the bike?

it has to be b, about 97 percent.

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.

i already answered it by 34/s