List four costs (negative aspects) of using fossil fuels in thermal power stations.

Paying for fuel

Paying for disposal of waste products used in remediation

Paying for clean up of spills

Paying for ads to counter negative publicity from people who think that wind or solar can replace those fuels in the near future.

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.