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Handout
Curated OER

National Park Service: Varying Valleys

For Teachers 3rd - 8th
The NPS offers a good description of the three main types of valleys, lesson objectives, and modeling activities.
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Handout
Jim Loy

Jim Loy's Geology Pages: Meandering Rivers

For Students 9th - 10th
Provides a diagram and a description of the movement of rivers and meandering patterns.