planet any of the large bodies that is around the sun.
gravity a force that attract or pull everything down.
inertia is the properties of a body to resist any change in its a state of rest or of uniform motion in a straight line.
meteorite piece of rock originating in outer space,fallen on the earth surface.
hydrosphere water of the earth.
lithosphere a solid part of the earth consisting by the crust and outer mantle.
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