1. November 14, 2013 Warm-Up Agenda How does erosion change a landscape?
Answer and then draw a picture to explain.
Objective:
Explain how moving water shapes the Earth’s surface.
Explain how water moving underground forms caves.
5.2 Notes
5.2 Questions
Homework:
Page 155; 1-5
IQIA

2. Moving Water Shapes Land

3. Streams Shape Earth’s Surface
The land is always higher than the water.
Water always runs downhill
This shapes the land by erosion and deposition

4. Drainage Basins and Divides
Drainage basin- area of land in which water drains into a stream system
Divide-ridge from which water drains to one side or the other
Drainage basin
Divide

5. Streams
Streams form
Stream is any body of water that flows down a slope along a channel.
Streams form from melting snow/ice or rainwater fall

6. Valleys
Valleys are formed as streams flow and carry sediment from the surface of the land.
This occurs in high areas and create V-shaped, straight, and narrow valleys
Valley

7. Floodplain
Area of land on either side of a stream that is underwater when the stream floods.
When streams flood a lot of the sediment carries by the stream is deposited in the floodplain.
They are very fertile
Floodplain

8. Stream Channels
As land flattens, streams and rivers widen and take curvier paths
Meanders-curves and bends that form a twisting, looping pattern in a stream channel
Moving water erodes the outside bank and deposits sediment inside the banks
May shift position over many years
Oxbow lakes- may form during floods where the stream may cut a new channel to bypass a meander.

9. Stream Channel
Oxbow lake
Meanders

10. Delta
Area of land formed by the buildup of sediment at the end (mouth) of a river
When a river enters an ocean, the water slows down and the river drops much of its sediment
This sediment gradually builds up to form a plain (can be fan shaped and extremely large)

11. Delta

12. Alluvial Fans A fan-shaped deposit of sediment at the base of
a mountain
Forms when streams
leave steep valleys and enter flatter plains
Fan is created when a stream slows down at the base and drops some of it’s sediment at the base of the slope

13. Water Moving Underground
Water can soak into the ground and become groundwater
Beneath the soil space can become completely filled with water.
Top of this area is the water table
Below water table is groundwater
Water table is different according to time and location-can change

14. Caverns Erosion takes place with this moving underground water.
Acidic rainwater can dissolve and carry away rocks that contain limestone.
Over time, open spaces are produced-CAVES!
Large caves are called caverns
Sink holes are formed when the roof of a cave is too thin to support the weight on the surface