| A | B |
|---|
| iron atom | act as tiny compass in igneous rock |
| subduction | occurs at trenches |
| heat transfer | energy movement |
| sonar | used to map ocean floor |
| diverging boundary | rift valley may form here |
| age of ocean floor rock samples | sea floor speading evidence |
| sea floor spreading | newest rocks form at mid -ocean ridge |
| pangaea | supercontinent |
| solid | earth's inner core |
| continental drift theory | continents once joined as a supercontinent |
| fossils and glacial features | continental drift evidence |
