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Comment: 01:58 - 02:48 (00:50)
Source: Annenberg/CPB Resources - Earth Revealed - 20. Running Water II: Landscape Evolution
Keywords: "James Sadd", "Colorado River", continent, energy, river, "river channel", erosion, sediment, valley, "mass wasting", landform, slope
Our transcription: Rivers like the Colorado are powerful geologic agents that disrupt and reshape the surface of continents.
The energy of running water in a river channel is transformed into processes that erode rock and sediment at the bottom of the channel and carry it downstream.
As the river deepens its channel, the sides of the valley steepen and grow unable.
Eventually, mass wasting processes are triggered causing these slopes to fail.
This delivers even more sediment to the river and widens the river valley even further.
In order to understand the influence of running water on the Earth's surface, we're going to look at a variety of rivers and also at different landforms at various stages of their development.
In doing so, we'll explore the connections between the geologic process of running water and the evolution of the surface of the Earth.
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