domingo, 26 de septiembre de 2010

Vocabulary#7

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


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 amoving object to keep moving in a straight line.



5. lithosphere: the hard, outerlayer of Earth, about 100 kilometers thick.




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




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




8.hydrosphere: Earth's water.


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