At the beginning of this unit you agreed or disagreed with statements about the processes that shape the Earth's surface. Not all of the statements were true. Now that you have completed the unit, carefully think about each statement again then decide whether you agree or disagree with the statement based on what you have learned. How many of your responses changed?

1. Erosion is a major process in changing the Earth's surface. (Agree / Disagree)
   
   See "D1 - Shaping Earth's Surface / Erosion and Deposition" for more information.
2. Gravity is the ultimate cause for all landslides. (Agree / Disagree)
   
   See "D2 - Mass Movement / Rapid Mass Movement" for more information.
3. Areas in the Arctic with permanently frozen soil do not experience any soil erosion. (Agree / Disagree)
   
   The process of solifluction describes the erosion of soil in permafrost areas. See "D2 - Mass Movement / Slow Mass Movement" for more information.
4. The action of glaciers is the single most important process in modifying the Earth's surface. (Agree / Disagree)
   
   Water is the Earth's most important agent of erosion. See "D3 - Water and Ice Landforms / Water Erosion" for more information.
5. A wide curve in a river is known as a meander. (Agree / Disagree)
   
   See "D3 - Water and Ice Landforms / Water Landforms" for more information.
6. Huge ice sheets have covered large parts of the Earth in the past. (Agree / Disagree)
   
   See "D3 - Water and Ice Landforms / Glaciers" for more information.
7. Sand dunes are formed by the wind. (Agree / Disagree)
   
   See "D4 - Wind Landforms / Wind Deposition" for more information.
8. Windblown soil can only be transported relatively short distances before it is eventually dropped. (Agree / Disagree)
   
   Loess deposits, for example, are created by wind transporting sediment great distances. See "D4 - Wind Landforms / Wind Deposition" for more information.