Across
- 2. The constant flow of water in a particular direction
- 4. When the ocean rises and falls, usually twice a day, due to forces from the Moon and the Sun
- 8. An underground layer of rock or sand that holds groundwater
- 11. A long period of time with very low temperatures on Earth’s surface and in Earth’s atmosphere
- 12. Rain, snow, sleet, or hail that falls from clouds in the atmosphere to Earth’s surface
- 14. The amount of salt dissolved in water
- 15. When the surface of water rises and falls due to wind or tides
- 18. Water in its gas form
- 19. A lot of water on Earth’s surface, either by extreme precipitation or an overflowing body of water
- 20. A natural opening on the seafloor that generates heated water, usually near tectonic plate boundaries
Down
- 1. A group of similar organisms that can reproduce
- 3. A series of very high, often dangerous, ocean waves caused by earthquakes under the ocean
- 5. Water that is added to land to help grow crops
- 6. An underwater ecosystem of living and dead coral and other organisms
- 7. Everywhere on Earth where water is in its solid form; ice
- 9. Water that has almost no dissolved salt
- 10. A group of very small organisms that float in water and are food for many animals
- 13. A large, slow-moving body of ice
- 16. The solid bottom of an ocean or sea
- 17. A period of very little precipitation