Please take out your IAN! of paper (in the blue tub) Glue in the half sheet of paper (in the blue tub) and complete it. Chapter 11 The Flow of Fresh Water

Chap 11, Sec 1&2 (The Active River) Objectives: Describe how moving water shapes the surface of the Earth. Explain 3 factors that affect the rate of stream erosion. Describe a watershed. Describe how a stream or river erodes and deposits sediment simultaneously (at the same time).

Tech Terms: tributary – a stream that flows into a lake or into a larger stream. watershed (aka drainage basin) – the region that collects runoff water that becomes part of a river or a lake.

divide – (aka mountains)an area of higher ground that separates neighboring watersheds (ex Continental Divide). The Continental Divide runs through the Rocky Mountains. It separates the watersheds that flow into the Atlantic Ocean and the Gulf of Mexico from those that flow into the Pacific Ocean.

Describe the difference between a watershed and a divide. A divide is the boundary that separates drainage areas. A watershed

Section1: Stream and River Deposits The Nile River Delta floods frequently, but many farms are located on the delta. In fact, even though flooding along rivers is potentially dangerous, many farmers have traditionally located their farms near rivers. Is this a sound agricultural practice? Where would you locate a farm? Write your answer in your science journal.

3Factors of Stream Erosion: 4.Gradient- 5. discharge – the amount of water that a stream or river carries in a given amount of time 6. load- (3 types) A stream’s ability to erode is influenced by these three factors!

Red Dye Meandering river Why do rivers curve? (3min) Red Dye Meandering river (1.5 min) hotlink

Rivers and streams deposit sediment where the speed of the water current decreases. Figure 1 shows this type of deposition. Placer Deposits Heavy minerals are sometimes deposited at places in a river where the current slows down. This kind of sediment is called a placer deposit (PLAS uhr dee PAHZ it). Some placer deposits contain gold. During the California gold rush, which began in 1849, many miners panned for gold in the placer deposits of rivers

Draw a picture of a river and make note of where the river is eroding and depositing simultaneously.

Tech Terms: 7. delta – a fan shaped depositional feature, formed when a load filled stream/river slows, as it enters a larger body of water. As sediment is dropped at the mouth of the Nile River, in Egypt, a delta forms.

8. alluvial fan – a fan shaped depositional feature, formed when a fast moving mountain stream flows onto a flat plain.

9. flood plain – the area along a river that contains rich, fertile soil due to periodic overflow from a stream/river. Virtual Textbook Lab

Rivers brainpop Why do rivers curve? One Little Disturbance (3 min review again)