| A | B |
|---|
| mid- Atlantic ridge | a long chain of connected under water mountians |
| molten rock | harrened lava |
| Pangea | one big piece of all the earth |
| Ring of fire | a long connected ring of active volcanoes that is all along the coast of the Pacific ocean |
| Convergent Boundries | Plates or boundries that move together or converge |
| Divergent Boundries | Plates or Boundries that move apart or divide |
| Mantle | The hot layer of earth made of lava that extends from the bottom of the crust to the core |
| Fault | A break or crack in the earths surface usually jagged |
| Magma | Molten rocck and lava beneth the earths surface |
| Ocean floor spreading | When parts of the mantle come up from a crack in the earths plates the lava then hardens to make new ocean floor |
| convection currents | the circular movment in material caused by the diffrernce in tempature |
| Hot spots | A section of the earth where lava has come fron the mantle or core had has burned through the crust |
| Trench | A arc or Vshapped vally on the ocean floor made by subduction |
| Lithosheric Plate | The top most layer of the earth made up of a nuber of plates |
| Sismograph | An instrament that detects and mesures sismic waves |
| Richter Scale | Is a chart that gives spacific numbers on how strong an earthquake |
| Four typyes of plate interaction | 1)Convergent 2)Divergent 3)subduction 4)Strike Slip |
| How the Rihcter Scale workes | The Rihcter Scaleis a way to determain the strength of a earth quake by the numbers on the chart |
