One propulsion method that is currently being studied for interstellar travel uses a large sail. The intent is that a force is created that pushes the ship away from the sun, much as wind propels a sailboat. What in particular is it that pushes against the sail

volume: 22

density: 7.04

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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.