| A | B |
|---|
| Atmosphere | air layer of gases that extend about 6000 miles above the Earth's surface |
| Biosphere | bio-life supports life(people , animal , plants) |
| Atoll | ring shaped island formed by coral building up along the rim of an underwater volcano |
| water cycle | contiuous movement of water on , above, and blow the surface of the EArth |
| polder | low lying area from which seawater has been drained |
| desalination or desalinization | removal of salt from seawater to make it usable for drining |
| elevation | geographic location of height above the fixed reference point(usually sea leverl) |
| erosion | weathering physical process-wearing away of the Earht's surface by wind, flowing water, and glaciers |
