1. Water Erosion
Chapter 3
Section 2

2. Standard
S 6.2.a – Students know water running downhill is the dominant process in shaping the landscape
S6.2.b- Students know rivers and streams are dynamic systems that erode, transport sediment in natural and recurring patterns.

3. Anticipatory Set Record how many drops a faucet releases in 1 minute
Place one bar of soap in a dry place
Place one bar of soap in a wet place
Let this go on for 10 minutes
What happened after 10 minutes to each bar of soap?

4. Vocabulary Runoff-water that moves over earth’s surface
Rill- runoff forms tiny grooves in the soil
Gully- large groove, or channel that carries runoff from storms.
Stream- a channel that water is flowing down a slope
Energy- the ability to do work or cause change

5. Vocabulary Language of the Discipline
Flood plain- flat, wide area of land along a river
Meander- loop-like bend in the course of a river
Oxbow lake- a meander that has been cut off from the river
Alluvial fan- a wide, sloping deposit of sediment- formed when a stream leaves a mountain range
Delta- sediment deposited where a river flows into a lake builds up a landform
Load- the amount of sediment that a river carries

6. Input

7. Input
Summer- water running, pebbles and sand move at the bottom of the river, it carries leaves downstream. Insects drink from the river
Winter- the stream freezes, chunks of ice grig away at the stream bed and banks.
Spring- stream floods and may be strong enough to move large rocks.
Streams- cause erosion because of the sediments it carries

8. Input Runoff- water that moves over Earth’s surface.
Runoff that flows in a thin layer over the land is called sheet erosion.
5 factors
Amount of rain
Vegetation
Type of soil
Shape of land
How people use the land

9. Input During sheet erosion, runoff forms tiny grooves called rills
Sheet Erosion- begins when runoff from rainfall flows in a thin layer over the land
A gully is a large groove that carries runoff from a rainstorm.
It moves soil and rocks only after it has rained.
Stream- continually flowing down a slope
Starts off as a stream, then becomes a river as it gets bigger.
Tributary- a stream or river that runs into another stream or river.

11. Input
Waterfalls- occurs when a river meets hard rock and erodes it slowly. It flows over the rock and then flows over softer rock downstream.
Softer rock wears away faster than harder rock
Floodplain- flat, wide area of land. This occurs when it overflows its banks during flooding

12. Input Meanders- loop like bend in the course of a river.
It erodes the outer bank and deposit sediment on the inner bank of a bend.
It can erode a wide flood plain. It’s channel is deep and wide
Oxbow Lakes- meander that has been cut from the river. Forms when a river floods.
When flood waters fall sediments dam up the ends of a meander and it has become an oxbow lake.

14. Input
Deposition creates landforms such as alluvial fans and deltas. It can also add soil to a river’s flood plain.
Alluvial fans- wide, sloping deposit of sediment formed when a stream leaves a mountain range.
Flows out of steep and narrow mountain range and suddenly becomes wider and shallower.
Deltas- sediment (deposition) deposit where a river flows into an ocean or lake builds up a landform.
Delta of the Nile in Egypt is shaped like a triangle. They can be all different shapes.

15. Checking for Understanding
What is a gully?
What is a flood plain?
What is a meander?
Describe a delta

16. Guided Practice Independent Practice
GP- page 56 # 1-19
Stop and have teacher look at answers
IP- Water Erosion Worksheet