Across
- 3. Large accumulations of underground water in permeable rock, soil, or sand that are excellent sources of water.
- 5. _______ is when solids in sewage are sent to settling tanks and larger particles settle to the bottom.
- 6. Treated water that is released back into the environment.
- 9. Water, whether liquid, solid, or gas, that contains a low concentration of dissolved salts.
- 14. __________ __________ occurs when water vapour reacts with airborne pollutants, particularly sulfur dioxide and nitric oxide.
- 15. When more rain falls and the water completely fills the spaces above an impermeable layer causing the soil to become saturated with water.
- 18. The movement of water that influences our weather, keeps rivers and lakes full, purifies water, and sustains many forms of life is called _______ ________.
- 20. Water that has soaked into the soil is called ________ _______.
- 22. Long walls of soil built along the banks of a river to prevent flooding are called ________.
- 23. The average concentration of salt in water.
Down
- 1. Where rivers flow into an ocean, are affected by tidal action.
- 2. A ________ is a flat area of land formed by sediment that has settled at the mouth of a river over many thousands of years.
- 4. __________ is the breakdown of rock into sediments.
- 7. The upper level of the saturated zone is called ____________.
- 8. The process when so much water gathers in the clouds that the air currents can no longer keep it aloft.
- 10. The wearing away of Earth's surface, caused by the movement of materials from one place to another is called ________.
- 11. Runoff from riverbanks and the surrounding land carries _______, which includes gravel, sand, silt, and mud into the river.
- 12. ________ _______ is water from sinks, baths, washing machines and toilets.
- 13. action As water evaporates a process called ________ _______ draws more water up from below ground, due to the force of cohesion between water molecules and the force of adhesion between water molecules and soil particles.
- 16. ________ ________ is rainwater and melted snow that run off streets and the surface of the land.
- 17. A _______ ________ is a relatively flat area on either side of a river that floods when the water levels rise higher than normal and the river overflows its banks.
- 19. When gravity causes the water to sink into the ground, dissolving salts and minerals as it moves through the spaces between the soil particles.
- 21. As the current of a sediment-laden river slows, the sediment begins to settle to the bottom, a process called ________.