| A | B |
|---|
| Pangaea | Super continent, also means "all lands". |
| continental drift | Idea that the continents slowly moved over earths surface. |
| fossil | Any trace of an ancient organism that has been preserved in rock. |
| mid-ocean range | The longest range of mountians in the world. |
| sonar | Bounces sound waves off the ocean floor and and records of the echos. |
| sea-floor spreading | Process that continually adds new material to the ocean floor. |
| deep-ocean trench | A deep under-water canyons |
| subduction | Process in which the ocean floor sinks into a deep ocean trench and back into the mantle. |
| plate | A seperate section of the lithosphere. |
| scientific theory | A well-tested concept that explains a wide range of observations. |
| plate tectionics | Explains the formation, movement, and the subduction of the Earth's floor. |
| fault | Breaks of the Earth's crust |
| transform boundary | Place where two plates slip past eachother, moving in opposite directions. |
| divergent boundary | The place where two plates move apart. |
| rift valley | Occurs when a divergent boundry develops on land. |
| convergent boundary | The place where two plates come together. |
