Across
- 2. to observe, check, or keep track of something for a specific purpose
- 7. area of land that drains into one main lake or river
- 10. a shelf of land that extends out from the edge of a continent below the ocean’s surface
- 13. the deepest part of the ocean; much of this water receives no light and contains little oxygen
- 14. water containing a large amount of salt.
- 17. highest point of land on a continent, river flows into different oceans depending on which side of the divide they start
- 18. measure of the amount of substances besides water in a water sample
- 19. the shoreline area where animals and plants live that withstand the pounding of the waves
- 20. daily change in water level of the oceans
- 21. the movement of water through a membrane from an area of lower water concentration to one of higher concentration
- 23. description of the variety of different species in an ecosystem
- 25. amount of dissolved salts in water
Down
- 1. water that is safe for humans to drink
- 3. water containing a high concentration of calcium
- 4. characteristics used to describe a stream or river
- 5. changes in population may also result from natural causes or human activities
- 6. the circular movement of water particles that causes a change in pattern that moves along the water's surface
- 8. stream of water that moves within a larger body of water
- 9. changes that take place over a relatively short period and don’t last very long
- 11. a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms
- 12. technique for separating solutions that involves boiling and condensation
- 15. group of organisms of the same species that live in a particular area
- 16. is the average weather measured over a long period of time
- 22. eroded rock fragments and soil carried by water or wind
- 24. one of the most diverse and richest ecosystems