| A | B |
|---|
| asthenosphere | plastic-like layer below the lithosphere |
| plate tectonic theory | theory used to explain the movements of earth's lithosphere and geologic symptoms of those movements |
| continental drift | idea that continents moved to their current positions on Earth by plowing through the ocean floor |
| Hess | work lead to Sea Floor Spreading Theory |
| convection current | motion underlying plate tectonics |
| magnetometer | instrument for studying Earth’s magnetic field |
| Pangaea | large landmass that existed approximately 300 million years ago |
| divergent boundary | boundary where plates move apart from each other |
| convergent boundary | boundary at which plates collide |
| transform boundary | place where plates slide past one another |
| plates | large sections of Earth’s crust and upper mantle |
| seafloor spreading | process that forms new seafloor |
| Wegener | combined evidence from around the world into the Continental Drift Theory |
| hypothesis | an educated guess, based on observation; can be disproven, but not proven to be true |
| theory | summarizes a group of hypotheses that have been supported with repeated testing and evidence; valid as long as there is no evidence to dispute it; accepted as fact by scientific community; used to make predictions of events |
| law | generalizes a body of observations; no exceptions have been found; explain things, but does not describe them; accepted as fact, can sometimes be summarized as an equation |
| igneous rock | created by the cooling and/or crystallization of magma and/or lava |
| metamorphic rock | created by subjecting a rock to intense heat and pressure |
| sedimentary rock | compacted or cemented sediments |
| Mohs scale | used to comparatively measure the hardness of minerals |
