Strips of alternating magnetic polarities found in rocks in the ocean basins
provide evidence that earth's magnetic field has never reversed polarity
indicate changes in earth's gravitation field
conflict with the theory of plate tectonics
provide evidence for sea-floor spreading

the area between the graph and the t axis

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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.