Term
|
Definition
| Earth's surface is divided into a few large, thick plates that move slowly and change in size. |
|
|
Term
|
Definition
| idea that continents move freely over Earth's surface, changing their positions relative to one another. |
|
|
Term
|
Definition
| a hypothesis that the sea floor forms at the crest of the mid oceanic ridge, then moves horizontally away from the ridge crest toward an oceanic trench. |
|
|
Term
|
Definition
aparent movement of the poles
ancient poles were in different positions than the present poles. |
|
|
Term
|
Definition
| sliding of the sea floor beneath a continent or island arc |
|
|
Term
|
Definition
| a circulation pattern driven by the rising of hot material and the sinking of cold material |
|
|
Term
|
Definition
| a large, mobile slap of rock that is part of earth's surface. |
|
|
Term
|
Definition
| plates are composed of this relatively rigid outer shell of Earth |
|
|
Term
|
Definition
| a zone of low seismic wave velocity that behaves in a ductile manner because of increased temperature and pressure |
|
|
Term
|
Definition
| boundary between plates that are moving apart |
|
|
Term
| convergent plate boundary |
|
Definition
| lies between plates that are moving toward each other |
|
|
Term
|
Definition
| one at which two plates move horizontally past each other |
|
|
Term
|
Definition
| portion of fracture zone between two offset portions of ridge crest |
|
|
Term
|
Definition
| curved line of volcanoes that form a string of islands parallel to the oceanic trench |
|
|
Term
|
Definition
| both island arcs at sea and for belts of igneous activity on the edges of continents |
|
|
Term
|
Definition
| narrow columns of hot mantle rock that rise through the mantle, much like smoke rising from a chimney |
|
|
