| A | B |
|---|
| crust | the outermost layer of the earth |
| mantle | the magma layer of the earth |
| core | the very dense center of the earth |
| tectonic plates | sections of the earth's crust that move on the mantle |
| Plate Tectonics | belief that the earth is made of sections that move on the mantle |
| asthenosphere | the middle of the mantle, the plates float on this |
| mesosphere | the lower mantle up to the outer core |
| lithosphere | the crust and the upper mantle, contains the tectonic plates |
| convergent boundary | area where plates move into each other |
| divergent boundary | area where plates separate |
| transform boundary | area where plates slide past each other |
| tension | force caused by plates moving apart, stretches the crust |
| compression | force caused by plates colliding, creates folding |
| fault | break then sliding of rock formations causing layers to be unaligned |
| folding | bending and twisting of rock formations |
| uplift | rock formations rising |
| subsidence | rock formations dropping |
| sea-floor spreading | tectonic plates diverging, creating new ocean floor |
| continental drift | a large land mass separated and moved apart |
