The total amount of carbon dioxide in the atmosphere is estimated to have decreased by 10 to 15 percent since 1900. True False

gravititional force is a force that is acting around you, it is non-contactable and it is a force that pulls you to the core of the earth.

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layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

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.