| A | B |
| continental shelf | sloping land that creates a zone of shallow ocean water |
| subduction | this occurs when a heavier tectonic plate moves beneath a lighter one |
| reservoirs | artificial lakes made by dams on rivers |
| satellite | a body that orbits a larger body |
| isthmus | a neck of land connecting two larger land areas |
| delta | landform where a river meets an ocean |
| equinox | day on which the Sun's rays strike the equator directly |
| tributary | smaller river that runs into a larger river |
| Pangaea | some believe this to be Earth's original supercontinent |
| solstice | when the Sun's verticle rays are farthest from the equator |