| A | B |
|---|
| Axis | an imanginary straight line running through the earth from the N. Pole to the S. Pole |
| Seismic Waves | are a vibration that travel through the earth |
| Crust | Thin solid outer most zone of the earth |
| Mantle | A zone of rock nearly 2,900 km thick |
| Core | below the mantle, forms the center of the earth, made mostly of iron |
| moho | boundaries between the earth's crust and its mantle |
| shadow zones | location on the earth's surface where no seismic waves or only P waves can be detected |
| magnetosphere | region of space that is affected by the earth's magnetic field |
| gravity | the force of attraction that exists between all matters of the universe (isaac newton) |
| law of gravitation | force of attraction between any two objects, depends upon there masses and the distance between them. |
| revolution | movement of the earth around the sun |
| rotation | the spinning motion of the earth |
| perihelion | the closest point to the sun |
| aphelion | the farthest point to the sun |
| mantle | zone that makes up 2/3 of the mass |
| athenosphere | boundary between the eaarths crust and its mantel |
| solids | p waves and s waves can travel through? |
| core | possible source of the earths magnetism is the earth's... |
| mass | amount of matter in an object |
| decreases | distance from the center of the earth increases the force of gravity... |
