domingo, 26 de septiembre de 2010


1.Solar system: the sun and the objects that are traveling around it.

2.Planet: any of the eight large bodies that travel around the Sun and shine by reflecting it light.

3.Gravity: a force of attraction, or pull, between any object and any other object around it.

4.Inertia: the tendency of a moving object to keep moving in a straight line.

5.Lithosphere:the hard, outer layer of Earth, about 100 kilometers thick.

6.Crust: the rocky surface that makes up the top of the lithosphere.

7.Resource: any material that helps support life on Earth.

8.Hydrosphere: Earth's water.

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