| A | B |
|---|
| geology | scientific story of the origin history and structure of the earth |
| crust | a thin layer of the earth |
| island | a piece land surrounded by water |
| isthmus | a narrow strip of land connecting two large masses of land |
| delta | an object shaped like a triangle |
| lake | a large inland body of fresh water or salt water |
| magma | a mixture of finely divided solids with enough liquid to produce a mass |
| faults | to shift so as produce a fault |
| continental drift theory | theory that continents were once a hugh continent |
| convection | the act of conveying, transmission |
| converging | to tend toward or approach an interesting point |
| core | one of the magnetic donut shape masses that make up such a memory |
| continents | one of the principal land masses of the earth |
| peninsula | a piece of land that project into a body of water that is connected with the main land by an isthmus |
| gulf | a large area of the sea or ocean partialy enclosed by land |
| butte | a hill that rises abruptly from the surrounding area and has sloping sides and a flat top |
| lava | molten rock that reaches the earth surface through a volcano or fissure |
| plate tectonics | a theory that explains that global distribution of geological phenomena |
| percent of water | 75% |
| spreading | layer |
| faulting | a fracture in the continuty of a rock formation caused by a shifting of the earth's crust |
| mantel | the layer of the earth between the crust and the core |
| relief | the variation in elevation of an area of the earth surface |
| strait | a narrow channel joining to large bodies of water |
| volcano | an opening in the earth's crust through molten,lava,ash are ejected |
| sound | to measure the depth of water |
| canyon | a narrow chasm with step cliff walls,cut into earth by running water |
| volcanism | volcanic force of activity |
| fold | to form bends in |
| pangea | supercontinent |
| subduction | a geologia process in which one edge of one crystal plate is forced below the edge of another |
