Streams and Rivers. Carry water over land to oceans Almost ½ of the water that falls to Earth’s surface eventually ends up in a stream or river. Essential part of the water cycle Account for most of the erosion of Earth’s surface (most important agent of erosion). Chapter 13 Section 1.
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Chapter 13 Section 1
flows to the Atlantic
flows to the Pacific
in a given amount of time
a river has
change in distance
and may flood banks
Chapter 13 Section 2
How Streams Transport Materials
•Velocity (speed of stream)
• Discharge (volume of water)
Which stream carries larger/more sediment?
vertical sorting animation
settling rate by size, shape, density animation
Horizontal sorting in a stream animation
(instead of silt and clay)
Chapter 13 Section 3
~waterfall recedes further upstream
*Ex. Niagra Falls
Chapter 13 Section 4
1. Small sediments are deposited where the stream slows down.
Friction causes slow down
Small Sediment (Sand)
Cross Section on next slide
Cuts into curve (erosion)
The river becomes so s-shaped, that the next time the river floods…
it is easier for the water to "take a short cut" and go straight across the flood plain.