1. Assignment #8 Ebb and Flow: a river’s changing course
LO: To describe how a river changes over time.
EQ: Describe how rivers change over time.
Catalyst
What are the 6 benefits of a river?
Define: floodplain
Define: flood cycles
AGENDA 10/29
Pictures
Demonstration
Processing task
HOMEWORK

2. Flood cycles
Flood cycles- rivers periodically shrink and swell If there are lots of storms the floods might be particularly bad one year

3. Flood cycles
Rivers change course A LOT

4. Can you find where the river used to run??

5. Remember: different speeds of the river cause more or less erosion As rivers flow, the erosion can be uneven Forms meanders, curves in a river As meanders change shape, it can leave an oxbow lake

6. Erosion changes a river over time meanders close and form oxbow lakes (copy comic from board)

7. People have been building homes on floodplains since the beginning of civilization…
WHY?!?!