How and why do river features change downstream?

Starter: When you think of rivers…what comes to mind?

Homework: DUE IN TUES 15thFind the definitions, draw a diagram and learn the definition of the following words for a spot test next week.

-Erosion-Hydraulic action-Corrasion-Corrosion (solution)-Attrition-Weathering-Physical-Chemical-Biological-Soil Creep-Mass Movement

Stages in the Stages in the development of a development of a

River ValleyRiver Valley

The river cuts downward to form a ‘V’shaped valley. The river starts

to meander

What happens next?What happens next?

River uses its meanders to cut from side to side eating intothe valley

Floodplain starts to form1

Floodplain River bluffs

River cliff

Alluvialdeposits

http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active

1.Copy the diagram of the drainage basin on page 66 into your books

2. Add on the information from the next slide onto it

3. draw the 3 different cross sections on the upper middle and lower course pg 65

4. Add on the information from page 66

WORD BANK – use these key geographical words to fill in the gaps

Source Mouth Confluence Wider

Watershed Drainage Basin Flood Plain Tributaries

A DRAINAGE BASIN

June 2011

How does a river change from source to mouth? True or False

• The valley gets narrower

• The gradient gets steeper

• You find interlocking spurs in the upper course

• The watershed is the highland that surrounds the watershed

• Deltas are found at the river’s mouth

• Wide flood plains are found in the upper course

• A confluence is when 2 rivers meet

• Tributaries are bends in rivers

What are the main features of a river?