| A | B |
|---|
| Pangaea | super continent that existed 200 million years ago |
| Atlantic | ocean created when the super continent broke apart |
| Alfred Wegener | scientist who thought that the continents were once one super continent |
| Mesosaurus | reptile fossil found in South America and in Africa |
| sea-floor spreading | theory that new ocean crust is formed at the mid ocean ridges by molten lava |
| lithosphere | crust and upper mantle |
| mantle | the largest layer inside Earth |
| crust | outer most layer of Earth |
| inner core | solid core composed of dense iron and nickel |
| outer core | liquid core composed of iron and nickel |
| asthenosphere | plastic layer below the lithosphere |
| plates | large sections of Earth's crust and upper mantle, lithosphere |
| plate tectonics | theory that Earth's crust and upper mantle are broken into sections |
| continental drift | theory that the continents move |
| divergent boundary | boundary between two plates that are moving apart |
| convergent boundary | boundary where two plates are moving toward each other |
| transform fault boundary | boundary where two plates are moving past each other |
| convection current | cycle of heating, rising, cooling and sinking |
| subduction zone | area where a denser converging plate desends or sinks under a less dense converging plate |
| San Andreas Fault | example of a transform fault boundary |
| mid-ocean ridge | example of a divergent boundary in ocean crust |
| Himalaya Mountains | example of boundary where continental crust collided |
| constructive force | force that builds up the Earth's surface |
| destructive force | force that breaks down Earth's surface |
| Geologist | scientist who studies the forces that make and shape Earth |
| basalt | cooled lava rack, makes up oceanic crust |
| granite | light rock, makes up continents |
| theory | an idea that has not yet been proven false |
