Across
- 2. a chemical that an organism needs to live and grow that is taken from the environment; it can be an organic or inorganic compound
- 4. impound reservoirs created in river valleys by placement of a dam across the river
- 5. oxygen— oxygen gas absorbed by and mixed into water
- 9. island— a long narrow island of sand that runs parallel to the mainland
- 10. an artificial or natural lake built by placing a dam across a stream or river and used to store and often regulate discharge of water; underground storage area of water, such as in an aquifer
- 12. matter— material that comes from plants or animals either dead or alive that is capable of decay; important in the transfer of nutrients from land to water
- 13. zone— an area in which the water contains low or no dissolved oxygen causing a condition known as hypoxia
- 14. a barrier or structure, natural or made by humans or animals, that is places across a stream or river to hold water back from flowing downstream
- 15. water with about 3.5% salt content; ocean water or seawater
- 16. a partly enclosed body of water along the coast where one or more streams or rivers enter and mix freshwater with saltwater
- 19. a wetland in which trees or woody shrubs predominate
- 21. submerged rooted aquatic plants that tolerate salinity
- 23. water that soaks into and refills an aquifer
- 24. a chemical that an organism needs to live and grow that is taken from the environment; it can be an organic or inorganic compound
- 25. community, benthos— the community of organisms that live on or in the floor of a body of water, including rivers, lakes, estuaries, and oceans
- 26. a body of water partially enclosed by land that is directly open or connected to the ocean
- 27. a low lying area where the soil is saturated with water at least seasonally, and supports plants adapted to saturated soils
- 30. a large body of standing water
- 32. water with a salt content lower than about 0.05%; for comparison, sea water has a salt content of about 3.5%
- 33. a wetland dominated by reeds and other grass-like plants
- 34. a group of plants and animals living and interacting with one another in a particular place
Down
- 1. silt, sand, rocks and other matter carried and deposited by moving water
- 3. number and variety of living things in an environment
- 6. bank- the shoulder like sides of the stream channel from the water’s edge to the higher ground nearby
- 7. nonliving; not derived from living organisms; inorganic
- 8. oxygen— oxygen gas absorbed by and mixed into water
- 11. of or having to do with life or living organisms; organic
- 17. water that is so full of small particles, such as silt, that the water is no longer transparent but instead appears cloudy
- 18. the natural environment in which an organism normally lives, including the surroundings and other physical conditions needed to sustain it
- 20. a body of standing water small enough that sunlight can reach the bottom across the entire diameter
- 22. aquatic invertebrates with exoskeletons used as food, including various species of mollusks and crustaceans, such as crabs, shrimp, clams, and oysters
- 28. resource— something that is found in nature that is useful to humans
- 29. study of the relationships living organisms have with each other and with their environment
- 31. water— water that has more salinity than freshwater, but not as much as saltwater; often a result of mixing of freshwater and saltwater in estuaries