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Test/Quiz Review » Erosion & Deposition

Erosion & Deposition Erosion & Deposition

Erosion and Deposition

1. What is the greatest driving force for all erosion?

          Gravity

2.  What is the greatest agent of erosion?

          Running water (Streams, Rivers)

3. What agent of erosion is responsible for carving out V-shaped valleys?

          Rivers

4. What agent of erosion is responsible for carving out U-shaped valleys?

          Glaciers

5. What is the relationship between slope and rate of erosion?

          As slope increases, erosion rate increases (Direct)

6. What is the relationship between stream discharge and rate of erosion?

         As stream discharge increases, erosion rate increases (Direct)

7. In a meandering stream, where is erosion the greatest?

          Outside of a meander  

8. In a meandering stream, where is velocity the greatest?

         Outside of a meander

9. In a straight channeled stream, where is the velocity the greatest?

         In the center, below the surface

10. What is an oxbow lake?

          A cutoff from a meandering stream caused by extensive erosion on the outside of a meander.

11. What is the relationship between transported particle size and stream velocity? (ESRT page 6)

         As the stream velocity increases transported particle size increases (Direct)

 

12. What is the minimum speed needed to move a particle 0.2 cm in diameter? (ESRT page 6)

         10 cm/s

13. Name some characteristics of wind erosion

          Active in deserts and beaches, weathering by abrasion, pitted appearance, Ventifacts (rocks with flat surfaces due to wind-blown sand abrasion)

14. How can wind direction be determined by looking at a sand dune?

       Wind blows toward the gentle slope of a dune and deposits over the steep slope.

15. a. Describe the relationship between particle size and settling time

         As particle size increases, settling time decreases (Indirect)

      b. Describe the relationship between  particle size affects settling rate

          As particle size increases, settling rate increases (Direct)

16. a. Describe the relationship between particle shape and settling time

          As particle shape becomes more spherical, settling time decreases

     b. Describe the relationship between particle shape and settling rate

         As particle shape becomes more spherical, settling rate increases.

17. a. Describe the relationship between particle density and settling time

          As particle density increases, settling time decreases (Indirect)

     b. Describe the relationship between particle density and settling rate

         As particle density increases, settling rate increases (Indirect)

18. Describe the relationship between slope and rate of rate of deposition

         As slope increases, rate of deposition decreases (Indirect)

19. Describe the relationship between stream velocity and rate of deposition

          As stream velocity increases, rate of deposition decreases (Indirect)

 

20. Describe the relationship between stream discharge and rate of deposition

         As stream discharge increases, rate of deposition decreases (Indirect)

21. Where is deposition the greatest in a river system? Why?

        Inside of a meander or Mouth of a River because Stream Velocity decreases

22. What agent of erosion leaves behind a pile of unsorted sediments?

          Glaciers

23. How does graded bedding deposition develop?

         Vertical sorting of sediment- When a large mass of sediment is deposited in a quiet body of water. Example : A landslide dumps sediment into a lake. All the large sized particles deposit first on the bottom and size increases to the top of a graded bed.

24. What causes horizontal sorting of sediments?

         When a stream/river enters a larger body of water such as the ocean. The river's velocity slows down and large sediment is deposited first, as distance from the shore increases size decreases.

25. Explain how sediments are carried in moving water in solution, suspension, Floatation and bed load

        The smallest sediments are dissolved in water are carried in water in solution. Ions of salt such as sodium and chlorine are carried in water by solution.

        Sediments carried in suspension are small enough that they settle out of the water very slowly. Silt and clay in suspension gives streams a muddy appearance. (Ole Muddy Mississippi)

        Fresh leaves, tree branches, and other organic remains are less dense than water and float on the surface.

       If a stream is flowing quick enough, sediments roll or bounce along the bottom of the stream as bed load.

26. How is till, erratics, and striations evidence of glacial erosion and deposition?

        Till is a pile of unsorted glacial sediment

          Erratics are large boulders deposited by glaciers

         Striations are scratches on the bedrock caused by the moving ice carrying sediments and scraping the surface of the earth



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