1. 3/12 – Today you have a test! Get out your notes and study!
DSQ #3 – What do deltas, bars, and sand dunes all have in common?

2. Lets Review!
What is the difference between a u-shaped valley and a v-shaped valley?

3. U – Shaped is made by glaciers. V-shaped is made by rivers.

4. Rill – Smallest
Gully – Next smallest
Stream – Larger
River Largest

5. Abrasion
A form of erosion that results in pitted or smoothly polished rocks.

6. Where is chemical weathering more rapid?
In moist, warm air

7. What do deltas, bars, and sand dunes have in common?
They all are created because sediment accumulates.

8. What is a delta?
A landform created when sediment accumulates in large amounts at the mouth of a river.

9. Mechanical Weathering
Animals
Ice wedging (freezing and thawing)
Plant roots
NOTICE: Sunlight DOES NOT cause weathering!

10. Chemical Weathering Acids
Oxidation (When iron is exposed to water and oxygen)

11. Canyons
Formed by streams (water)

12. AND
WATER IS THE MOST IMPORTANT AGENT OF EROSION!

13. Rock Flour
A fine powder left behind when GLACIERS scrape rock.

14. SOIL A mixture of organic matter, weathered rock, air, and water.
It is affected by organisms, parent rock type, and climate.

15. Deflation
WIND picks up small sediment and leaves behind larger sediment.

16. LOESS
Silt that is carried by the wind then deposited

17. MASS MOVEMENT Creep – slowly moves downhill
Mudflow – sediment mixes with water
Slump – along a curved surface
Rockslide – break loose and fall