| A | B |
|---|
| Axis | imaginary line through the earth's center |
| Sun | center of the solar system |
| Artifacts | Tools and pottery from past |
| Year | full revolution of the earth |
| isthmus | a narrow piece of land that connects two larger pieces of land |
| plateau | flat area at a high elevation |
| 365 1/4 | number of days it takes for the earth to travel around the sun |
| earth's crust | ocean floors and continents |
| geography | study of the earth in all its variety |
| seasons | changes caused by the earth's orbit |
| weathering | breaks surface rocks in boulders, gravel and sand |
| pangaea | theory that all planets used to be connected |
| tsunami | huge wave formed by earthquake |
| strait | narrow stretch of waterway connecting two large waterways |
| solar eclipse | moon passes between the sun and earth |
| erosion | water, wind and ice move weathered material |
| valley | lowland area between higher lands such as mountains |
| mantle | plates that form the earth's crust float in liquid rock there |
| continental drift | movement of the earth's huge landmasses |
| glacier | large thick body of slow moving ice |
