Vocabulary #7

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

2.Planet: Any of the nine large bodies that travels 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 tendecy of a moving object to keep moving in a staight line.

5.Lithosphere: The har,outer layer of earth,about100 kilometers thick.

6.Crust: The rocky surface that helps support life on earth.

7.Resources:  Any materials that help support life on earth.

8.Hydrosphere: Earth"s water