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# Download 8. Explain erosion. How does this impact the land?

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```Unit 4 Study Guide Key
Name___________________________
LANDSAT (ISN Pg. 74-75)
1. What can a single snapshot LANDSAT image show?
Physical features; Man-made Structures; Shape of land; Ground Cover; Land use
2. What can images over time show? (think of what this unit is about)
Changes to land over time (erosion, deposition); Climate change (melting of glaciers); Changes in
vegetation; Changes in land use
Topography (ISN pg. 76-79): How can topographic maps be used?
3. Be able to match a cross-section to a topographic map, like in the example above.
1-B; 2-A; 3-D; 4-C; 5-E
4. Be familiar with the terminology associated with Topographic maps. (ISN pg 77)
5. What do hash marks on a contour line indicate? Hash marks indicate a depression in the land.
In other words, instead of counting up from the last contour line, you would subtract the interval from
the last contour.
Unit 4 Study Guide Key
Name___________________________
6. Describe how to know if an incline is steep or a gradual incline.The closer together the contour
lines, the steeper the incline. If they are far apart, it is a gradual incline.
Changes to the Land (ISN pg. 80-81))
7.
Explain weathering. How does this impact the land?
Weathering is the breakdown of rock into smaller pieces. This impacts the land by allowing forces of
erosion to act more easily on those sediments.
8.
Explain erosion. How does this impact the land?
Erosion is the wearing away of surface material. This moves sediment from one location to another.
Potentially constructing new land forms while destructing others.
9.
What is deposition?
Dropping of sediments that occurs when the processes of erosion lose their energy and can no longer
carry the material.
10.
What are the agents (methods) of erosion and deposition?
Wind, rain, floods, glaciers, coastlines, rivers/streams
Constructive and Destructive Forces
11.
What is a constructive force?
A constructive force is a natural force that builds up a landform.
12. Provide examples of constructive forces. Be able to identify the constructive force at work
when given an example or picture.
Flooding, coastlines, rivers/streams, wind, convergent plate boundaries, divergent plate boundaries,
and volcanic activity
13. What is a destructive force?
A destructive force is a natural force that wears down a landform.
14. Provide examples of destructive forces. Be able to identify the constructive force at work
when given an example or picture.
Flooding, coastlines, rivers/streams, wind, convergent plate boundaries, divergent plate boundaries,
and volcanic activity
Unit 4 Study Guide Key
Name___________________________
15. Do these forces work together or separately? Explain how.
These forces work together. While one area is being destructed, potentially through a process such as
flooding or river/stream erosion, the sediments are carried to another location and deposited,
creating a buildup of a landform.
16. Do these processes happen over a short period of time or a long period of time?
While major events can cause these processes to happen over a short period of time, these processes
typically happen over a long period of time.
17. Be able to provide an answer for the BIG AHA UNIT QUESTION! (What processes other
than plate tectonics change Earthâ€™s surface?)
```
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