What is an angle of incline? how do you find out what the angle of incline for that slope is?

It refers to the tangent of the angle of that surface to the horizontal

We can take horizontal line as principle line and can find degrees above it in anti-clockwise manner

explanation:

the masses of the objects and the distance between them

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.