Vocabulary#8
solar system: the sun and the objects that are traveling around it.
planet: any of the nine large bodies that travel around the sun and shiny by reflecting its light.
gravity: a force of attraction,or pull,between any objectsand any other objects around it.
inertia: the tendency of a moving object to keep moving in a strigh 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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