Vocabulary #11

1. solar system: the Sun and th objects that are traveling.
2. planet: any of the 8 large bodies that travel around the Sun and shine by reflecting its light.
3. gravity: a force of attraction, or pull, between any object and any other objects around it.
4. inertia: the tendency of a moving object to keep movimg in a straight line.
5. lithosphere: the hard, outer layer of Earth, about 100 kilometers thick.
6. crust: the rocky surfacethat makes up the top of the litosphere.
7. resource: any material that helps support life on Earth.
8. hydrosphere: Earth's water.