| A | B |
| landforms | physical features on the Earth's surface |
| mountain range | group of connected mountains |
| piedmont | area at or near the foot of a mountain |
| sea level | level of the surface of the oceans |
| plateau | broad area of high mostly flat land |
| basin | low, bowl shaped land |
| volcano | opening in the Earth through which hot lava and gases pour out |
| current | part of a body of water flowing in a certain direction |
| tides | regular rise and fall of an ocean |
| inlet | area of water extending into the land from a larger body of water |
| sound | long inlet that often separates offshore islands from the mainland |
| tributary | a river that flows into a larger river |
| drainage basin | land drained by a river system |
| fall line | place where the elevation of the land drops sharply |