erosion
Sand on a sill: what will happen to a sand grain left on a window sill? - a rock cycle discussion
Bill nye the Science Guy: Erosion
Landscapes and Surface Processes
Fire and Ice
Weathering Limestone - with my own breath! A classroom demonstration of how limestone is weathered (PDF)
Karstic Scenery - In 60 seconds: Modelling the chemical weathering of limestone (PDF)
Earth's Ever-Changing Surface
Breaking It Down -- Weathering and Erosion
Will a mountain last forever?
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