| A | B |
|---|
| geology | scientific study of the origin, history, and structure of the earth |
| crust | thin rocky surface of the earth |
| % of water on earth | more than fifty percent |
| island | a land mass one smaller than a continent and is completely surrounded by water |
| isthmus | a narrow strip of land connecting two larger land masses |
| delta | an object shaped like a triangle |
| lake | a large inland body of salt or fresh water |
| magma | molten rock |
| faults | a crack in the earths crust |
| continental drift theory | pangea drifted apart to form the different continents over thousands of years |
| convection | a circular movement that occurs when materials are heated, expands and rises then cools and falls |
| converging | to move together toward union or toward common conclusion |
| inner core | solid and made of very dense/heavy material - - iron,nickel,alloy |
| continents | one of the principal land masses of the earth |
| archipelago | a large group of islands |
| peninsula | a long protection of land and water |
| gulf | a large area of sea or ocean partially enclosed by land |
| butte | a hill that rises abruptly from the surrounding area and has sloping sides and a flat top |
| lava | magma on the surface of the earth flows and often creates disrinctive cone shaped mountains |
| plate tectonics | earths outer shell is not solid piece of rock |
| sea floor spreading | when the oceanic plates pull away from each other |
| spreading | when plates pull away from each other |
| faulting | when there is a break in the earths crust. movement can go sideway, up or down |
| mantle | surrounds the core and is a thick layer of rock that has pockets of magma |
| relief | variations in elevation of a portion of the earths surface |
| strait | a narrow body of water connecting two larger ones |
| volcano | form when magma breaks through the surface of the earth |
| sound | free from defect, decay, or damage |
| canyon | a narrow chasm with steep walls, formed by running water |
| volcanism | movement of magma inside the earth |
| fold | when rock layers bend or buckle. usually found where the seafloor is sliding beneath the surface |
| pangea | a hypothetical supercontinent that included all the landmasses of the earth before the triassic period |
| rift valley | a long narrow depression in the earths surface formed wehn the land sinks between two fairly parellel faults |
| subducton | when an oceanic plate and a continental plate crash into each other |
