Across
- 4. a ridge of sediment that is built to control flooding onto land (that is below sea level)
- 5. boundaries that slide past each other and create earthquakes
- 7. a structure built at right angles to a beach to prevent beach erosion
- 8. a device that is used to measure and predict earthquakes, volcanoes, and tsunamis
- 12. the sudden movement of rock downhill because of gravity
- 13. a wide, flat area that is formed when a river overflows onto the land and drops sediment
- 14. forces that build up the earth
- 15. plowing a method that farmers use to prevent erosion of topsoil
- 16. a structure built parallel to a beach to prevent erosion and weathering
- 18. rock, dirt, soil, sand
- 19. a structure built across a river to control flooding
- 20. forces that destroy the earth
- 21. a ridge of rock and soil that is deposited when a glacier melts
- 22. nourishment a method used to build up beaches again after they have eroded away
Down
- 1. a break at the earth's crust that causes an earthquake
- 2. a method that farmers use to prevent erosion of topsoil (looks like stairs)
- 3. the dropping of sediment
- 6. the movement of sediment from one place to another
- 9. the force that pulls all object towards the earth
- 10. a landform that is created at the mouth of a river as the river flows into a larger body of water
- 11. a large, slow moving piece of ice
- 14. boundaries that come together in order to form mountains
- 17. the breakdown of rock
- 19. boundaries that move apart and form volcanoes