Lecture 27 (Monday, April 1, 2002): Erosion and Streams
Brief outline of this lecture:
Landscapes undergoing erosion
Main points of this lecture:
Erosion is the removal of soil and pre-existing sediments by flowing water, air, or ice.
Steep slopes with little vegetation favor erosion.
Different rock types erode at different rates.
Erosion produces drainage patterns that vary with underlying geology and pre-existing overall slope.
Erosion commonly progresses from landscapes with broad uplands and few valleys to landscapes with broad valleys and isolated uplands.
Changes in base level cause changes in the extent of erosion or deposition on a landscape.
Figures used in this lecture:
Some erosional landforms
Base level, and effects of falling base level
Effects of rising base level
Progress of erosion (landscape evolution)
Reading assignment: Chapter 6.
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