| A | B |
|---|
| Richter scale | measurement to describe the force of an earthquake |
| mountain | any point that rises 1,000 feet above its surroundings |
| atmosphere | mixture of gases that surround the earth |
| ring of fire | a large belt circling the pacific ocean where most volcanoes occur |
| magma | molten rock inside the earth |
| mantle | earth's thickest layer made of very hot rock |
| fault | a break in the earth's crust |
| crust | earth's thinnest layer |
| geology | study of the earth, its crust, rocks and other physical features |
| inner core | layer of solid iron and nickel |
| continental drift | the continual movement of the continents |
| earthquake | shaking and trembling of the earth's crust |
| pangaea | states that the continents were at one time joined together as a single land mass |
| lava | magma that reaches the earth's surface |
| volcano | an opening in the earth through which molten rock reaches the earth's surface |
| outer core | a layer of liquid iron and nickle |
| plate tectonics | states the earth is made of plates that move slowly |
