| A | B |
|---|
| Archipelago | a group of islands |
| Island | a piece of land surrounded by water |
| River | a large natural stream of water flowing in a channel to the sea, a lake, or another such stream |
| Volcano | a mountain or hill with a crater or vent through which lava, rock fragments, hot vapor, and gas erupt through the earth's crust |
| Strait | a narrow passage of water connecting two seas or two large areas of water |
| Orbit | to circle around something |
| Plain | a large expanse of land that can be flat or have a gentle roll |
| Axis | an imaginary line that runs through the Earth from the North pole to the South pole |
| Revolution | a complete trip of Earth around the sun |
| Gulf | a deep inlet of the sea almost surrounded by land, with a narrow mouth |
| Lake | a large body of water, surrounded by land |
| Rotation | spinning on an axis |
| Peninsula | a piece of land almost surrounded by water or projecting out into a body of water |
| Bay | a broad inlet in the sea where the land curves inward |
| Delta | an area where sand, silt, clay, or gravel is dropped at the mouth of a river |
| Plateau | a flat area that rises above the surrounding land |
