Across
- 3. drains a system of pipes or channels that carry away storm water
- 4. way a prepared path for flood waters to flow over, often to prevent damage to communities
- 6. island land formed over many years by the build up of sand and dirt just offshore of the mainland
- 9. thick layer of earth's structure, just below earth's crust
- 11. a wall along a river channel or other body of water that serves to prevent flooding by keeping water behind it
- 12. the deepening or widening of a river or harbor
- 13. shell formed from earth's solid upper mantle and crust
- 14. the thin, rocky outer layer of earth that makes up the continents and the ocean floor
Down
- 1. a wall across a river that controls the flow of the river water
- 2. the physical remains or trace of a plant or animal that lived long ago
- 4. crack in earth's crust along which movement takes place
- 5. tectonics the idea of giant plates of rock moving slowly across earth's surface
- 7. an artificial lake, often formed when water collects behind a dam
- 8. waves waves sent through earth's crust during earthquakes
- 10. thin, narrow wall built from the shoreline into the ocean
- 14. earth's innermost structure