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January 09, 2014

January 09, 2014. Agenda Roll New Seating Bathroom Passes PowerPoint titled: Stream and River Deposits Possible Video. Subject Area: Stream and River Deposits EQ: How does a river or stream system constantly change over time? Questions:

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January 09, 2014

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  1. January 09, 2014 Agenda Roll New Seating Bathroom Passes PowerPoint titled: Stream and River Deposits Possible Video

  2. Subject Area: Stream and River Deposits EQ: How does a river or stream system constantly change over time? Questions: • What are the different types of stream deposits? • What is the relationship between rich agricultural regions and river flood plains?

  3. Stream and River Deposits Flowing rivers can pick up and move soil and rock. Sooner or later, this material must be deposited somewhere.

  4. Deposition Deposition is the process by which material is dropped, or settled. In a mud puddle, if the water is not disturbed the particles will deposit on the bottom and the water would appear clear.

  5. Deposition in Water After rivers erode rock and soil, they deposit the rock and soil downstream.

  6. Alluvium Rock and soil deposited by streams is called alluvium. Alluvium is dropped at places in a river where the speed of the current decreases. Partner Question: What happens to a river’s flow that causes alluvium to be deposited? When the river’s flow … alluvium is deposited.

  7. Placer Deposits Heavy metals are sometimes deposited at places in a river where the current slows down; this is called placerdeposits. Some placer deposits contain gold. This is how the gold got into the rivers during the California gold rush.

  8. Delta The current slows when a river empties into a lake or ocean. Much of the river’s load may be deposited where the river reaches the large body of water, forming a fan-shaped deposit called a delta.

  9. Mississippi River Where the Mississippi river flows into the Gulf of Mexico, the Mississippi Delta has formed.

  10. Deposition on Land When a fast moving mountain stream flows onto a flat plain, the streams speed is greatly reduced due to the decrease in the stream’s gradient.

  11. Alluvial Fans As the stream slows down, it deposits alluvium. When the stream deposits where a mountain meets a flat plain it forms an alluvial fan. Alluvialfans are fan-shaped deposits that form on dry land. Partner Question: How are alluvial fans and deltas similar? Alluvial fans and deltas are similar because … How are they different? Alluvial fans and deltas are different because …

  12. Flood Plains During periods of high rainfall or rapid snowmelt, a sudden increase in the volume of water flowing in a stream will cause a stream to overflow, this is called a floodplain.

  13. Mississippi River Valley Flood plains have rich soil for farming. The problem is that when it does flood it can cause a tremendous amount of propertydamage. In 1993 the Mississippi River flooded causing farms and towns to be abandoned. The flood was so huge that it caused damage in nine Midwestern states. Partner Question: Why are flood plains good farming areas? Flood plains are good farming areas because …

  14. Summary • Answer the essential question “How does a river or stream system constantly change over time?” • Your answer needs to be in complete sentences. • Place your answer at the bottom of the notes we did today. • Make sure you include what alluvium is and where it is deposited. • Use your notes to get the answers.

  15. Lakes, Rivers, and other Water Sources What did you know? • ________________________________ • ________________________________ • ________________________________ What did you learn? • ________________________________ • ________________________________ • ________________________________ What do you want to know? • _________________________________ • _________________________________ • _________________________________ Don’t Forget to put this in your Table of Contents!

  16. Homework Chapter 10, Section 2 in the purple workbook. This is found on pages 76.

  17. Review What factors increase the likelihood that alluvium will be deposited?

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