The Hydrosphere

2. A measure of how much salt is dissolved in water
7. The sinking of surface water to the ocean floor
9. A low-lying area where water covers the ground, either regularly or permanently
11. An area of land that drains water into a stream or river
12. The system that contains all of Earth's water
15. The quality of water that makes it safe to drink
16. A living thing that produces its own food by using sunlight
19. An area where fresh water mixes with salt water, typically where a fresh water river meets an ocean.
21. A green substance in some cells that absorbs sunlight
24. An area of water with so little oxygen that animals can't survive
25. A substance that an organism needs to take in to stay healthy
26. An attractive force between any two objects that have mass
27. A measure of water quality relating to the number of living organisms
28. Water that flows over the ground

1. A large area of land that drains water into a major river
3. The rising of deep water to the ocean surface
4. A substance an organism needs to stay healthy and grow
5. A measure of the amount of oxygen in water
6. A large body of water surrounded by land, either natural or human-made.
8. A large-scale flow of sea water driven by natural processes
10. Water stored underground in soil or rock.
13. A small stream or river that flows into a larger river.
14. A large flowing body of water that moves from higher ground into a lake, ocean or another river.
17. An organism that breaks down dead matter by releasing chemicals
18. A measure of how cloudy water is
20. A measure of how acidic or basic a substance is
22. The amount of mass in a given volume of space
23. A sudden growth of algae in a body of water