| A | B |
|---|
| plates | slabs of earth's crust; about 13 major ones |
| crust | thinnest layer of the earth |
| pangaea | the name given to the super continent |
| Wegener | Scientist who came up with the theory of plate tectonics |
| fossil | trace or remain of a living organisms |
| convection current | movement of material due to heating and cooling |
| seismic | earthquake |
| mantle | layer beneath the crust |
| density | a measure of the amount of mass per unit of volume |
| mid-ocean ridge | long chain of mountains found underwater where the plates separate |
| subduction | when one plate goes under another |
| convergent | when plates go towards each other (connect) |
| divergent | when plates go away from each other (divide) |
| fault | a crack in the earth's surface |
| scientific theory | a set of ideas that have lots of evidence but are not repeatable |
| scientific law | phenomenon that can be repeated again and again |
| deep-ocean trench | big ditch caused by one plate going under another |
| molten | melted rock under the earth's crust |
