VOCABULARY:

solar system: the Sun and the objects arround it.



planet: any of the eight large bodies of  that travel around the Sun and shine by reflecting its light.

gravity: a force of attraction, pull, between any object and any other object around it

 inertia: the tendency of an object to keep moving in straight line.

lithosphere. the hard, outer layer of Earth, about 100km thick.

crust: the rocky surface that make up the top of the lithosphere.

resource: any material that help support life on Earth.

hydrosphere: Earth´s water.