| A | B |
|---|
| crust | thin, outer layer of the Earth |
| mantle | layer of rock under the crust |
| inner core | made of solid iron |
| outer core | made of liquid iron |
| lithosphere | made of crust and upper mantle rock |
| asthenosphere | mantle on which pieces of the lithosphere float |
| mesosphere | lower part of the mantle |
| tectonic plate | block of lithosphere which moves around |
| continental drift | idea that continents move |
| Pangea | one large land mass |
| sea-floor spreading | new oceanic lithosphere forms from magma |
| magnetic reversal | Earth's magnetic poles change |
| plate tectonics | explains how Earth's plates move |
| convergent boundary | formed when plates collide |
| divergent boundary | formed when plates separate |
| transform boundary | formed when plates slide paste each other |
| compression | stress from squeezing |
| tension | stress from pulling |
| folding | bending of rock layers |
| fault | break in rock |
| uplift | rising of parts of Earth's crust |
| subsidence | sinking of parts of Earth's crust |
