| A | B |
|---|
| inner core | the innermost layer of Earth's interior |
| subduction | one plate sinking under another |
| fault-block | moutains made of huge, tilted blocks of rocks surrounding faults |
| unwarped | moutains made when forces inside Earth push up the crust |
| lava | magma that reaches the surface |
| mantle | largest layer of Earth's interior |
| crust | Earth's outermost layer |
| plates | sections of the lithosphere |
| outer core | made of molten metal |
| fault | fracture in rocks where movement occurs |
| folded | mountains formed by folding rock layers |
| volcanic | mountains made of lava |
| sliding plates | earthquakes occur at this kind of plate boundary |
| oceanic-oceanic collisions | type of plate collision that involves subduction and deep ocean trenches |
| volcanic mountains | Mount St. Helens and Mount Popocateptl |
| subduction | when one plate sinks underneath another plate |
| separating plates | plates move apart, causing a mid-ocean ridge |
| convection | theory that says uneven heating, different densities, and cycling of materials cause plate movement |
| continental-oceanic collisions | type of plate collisions in which oceanic plates slide under continental plates |
| fault-block mountains | mountains made of huge, tilted blocks of rock separated from surrounding rock by faults |
| folded mountains | mountains formed by the folding of rock layers caused by compressive forces |
| continental-continental collisions | type of plate collision in which plates have similar densities, so they buckle and fold |
| four | number of layers in Earth's interior |
| boundaries | places where the eges of different plates meet |
| isostasy | principle that states Earth's crust and lithosphere flat on the upper part of the mantle. |
