| A | B |
|---|
| globe | a round model of the Earth |
| map | a flat drawing of all or part of the Earth’s surface |
| landform | natural feature of the Earth’s land surface |
| relief | ups and downs of the Earth’s surface |
| elevation | he height of an area above sea level |
| ecosystem | a community of living things and the surroundings in which they live |
| environment | the physical surroundings |
| research | the careful collection of information |
| challenge | something that is difficult |
| calendar | a system for breaking time into units and keeping track of those units |
| chronology | order of dates in which events happen |
| diagrams | an illustration for organizing and presenting complex information. |
