| A | B |
|---|
| Bolide | Large piece of space debris that chrashes into a planet |
| Basalt | Primary rock type in oceanic crust |
| Granite | Primary rock type in continental crust |
| Oceanic crust | Averages 4-7 km thick |
| Continetal crust | Averages 20-40 km thick |
| Rift valley | Splits many sections of the Mid-Oceanic ridge system |
| Mariana trench | Deepest place on Earth |
| Island arcs | Aleutian Islands off Alaska are an example |
| Salinity | total quantity of disolved salts expressed as a percentage |
| Gulf Stream | flows south to north along the east coast of the U.S. |
