Planet: any of the eight large bodies that travel around the Sun and shine by reflecting its light.
Gravity: a force of attraction,or pull, between any object and any other objects around it.
Inertia: the tendency of a moving object to keep moving in a straight line.
Lithosphere: the hard, outer layer of Earth, about 100 kilometers thick.
Crust: the rocky surface that makes up the top of the lithosphere.
Resource: any material that helps support life on Earth.
Hydrosphere: Earth´s water.
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