1. True
or False
Eutrophication can happen more quickly when fertilizers and detergents runoff into to ponds and lakes.

2. What is the precipitation that flows over land into streams, rivers, and lakes called?
Runoff

3. levee What is the buildup of
(natural or manmade sandbags) sediments deposited alongside the channel of a river to control flooding?
levee

4. Where does erosion happen
most often?
In fast moving
rivers and streams

5. In which part of the river is erosion most likely to occur?
The outside curve of a meander where the current is faster.

6. Dead organisms that drift down from above
What do organisms (fish, worms, etc.) at the bottom of a deep lake eat?
Dead organisms that drift down from above

7. What percent of the Earth’s water is FRESH water?3%

8. What percent of the Earth’s water is SALT water?
97%

9. Where can most of Earth’s fresh water be found?
ice and glaciers

10. It fills with sediment and becomes a meadow.
As a pond or lake begins to age eutrophication takes place and what eventually happens to the pond or lake?
It fills with sediment and becomes a meadow.

11. Describe the characteristics of an old river.
wide, flat floodplain
it has many bends (meanders) where it deposits rock and soil

12. What do plants and animals in fast-moving rivers and streams have to allow them to survive in the fast moving currents?
hooks and suction cups

13. When it empties into an even larger river.
When does a river become a tributary?
When it empties into an even larger river.

14. Why is life in a river and lake different?
A river has moving water
A lake has still water
A river may flow through several biomes
The life in a lake depends on the biome that it is in.

15. The process in which soil and rocks are left behind or ed.
What is ion?
deposit
The process in which soil and rocks are left behind or ed.
deposit

16. When the current slows down.
When does the river drop sediments down to the bottom?
When the current slows down.

17. Does sunlight reach the bottom of a pond or lake?

18. If the sunlight reaches the bottom does that help or discourage organisms to/from grow/ing and thrive/ing?
It would help the organisms to grow and thrive, so there would be more organisms in an environment where the sun reaches the bottom.

19. What is the source or the beginning of a river called?
Headwaters

20. What is a looping curve in a river called?
Meander

21. What is the wide and flat area around a river that can overflow its channel during heavy rains?
Floodplain

22. What is the fan-shaped area of deposited sediments at the end of a river called?
Delta

23. What is the area at the end of a river where it empties into a larger body of water such as the sea?
Mouth

24. smaller streams or rivers that feed into a larger river
What is a tributary?
smaller streams or rivers that feed into a larger river

25. How are a watershed and a divide related?
A divide is higher ground that separates watersheds by causing water to flow on direction or another.

26. In a river if a meander continues to grow and a flood cuts it off from the main river what will form?
Oxbow Lake

27. Explain how deposition and erosion form an oxbow lake
An oxbow lake is formed by the meander eroding outward.
Then through deposition the river drops off sediments in the center of the meander.
Then the river’s water flow is eventually cut off to form the oxbow lake.

28. the biome that it is located in
What determines a lake’s organisms?
the biome that it is located in

29. What affects/determines a river’s organisms?
The fact that it may flow through several different biomes thus changing the type of organisms that inhabit each section.

30. Where is the Oxbow Lake?

31. Where are the headwaters?

32. Where is the runoff?

33. Which arrow points to a meander?

34. Which arrow points a tributary?

35. Which arrow shows down river?

36. Where is the delta?

37. Where are the flood plains?

38. Where is the mouth of the river?