Chapter 9 Sec. 2 - rl063.k12.sd.us

Chapter 9 Sec. 2 - rl063.k12.sd.us

Chapter 9 Sec. 2 Stream Development Moving Water Adequate supply of water What happens to streams in areas of high precipitation? What happens to streams in areas of low precipitation? The region where water first accumulates is known as what?

Headwaters Where are common areas for head waters? Stream development As water accumulates in high in small gullies, water starts to move downward Stream channel narrow pathway into sediment or rock that the moving water carves The moving water is held in by ___________, the ground

bordering each side. Stream development The process by which small streams erode away soil and rock ahead of the stream is called ______________ What does head ward erosion do to the stream? Lengthens

What is stream capture? Stream Valleys As streams erodes creates a V-shaped valley Grand Canyon Continues until it reaches a base level: elevation where it enters another stream Lowest base: Sea Level Meandering Stream

Streams slope decreases as it reaches base level, as result, the channel gets wider. Why? Creates build up in the stream and erodes the sides of the channel Starts to bend or wind called a Meander Velocities of the water differ from where it is located within the stream. Outside greatest velocity Inside slowest velocity Diagram

Deposition of sediment Streams lose velocity lose the ability to carry sediment Alluvial Fan: Sloping depositional features from bases of slopes Sand or gravel Death Valley Delta: Triangular deposit into larger, quieter bodies of water

Silt and clay Mississippi River Age of streams Youth, Mature, Old Rejuvenation: to make young again Stream actively resumes down cutting towards its base level

Causes the channel to become V-shaped and start over

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