1. DEPOSITION
deposition is the process by which sediments are released, settled from, or dropped from an erosional system.
most final deposition occurs in large bodies of water (oceans and lakes).
deposition occurs when the velocity of the erosional system decreases.

2. 3 Factors that affect Sedimentation.
1) particle size
large particles settle (sink) first.
1st

3. diagram
1st

4. 2) particle shape
round particles will settle faster than flat particles. (frictional drag with slow particles down)
1st

5. diagram
1st

6. higher density particles will settle faster.
low
1st

7. diagram
low
high
1st

8. sorting
if a layer of sediment has particles that are similar in size (density or shape) they are said to be sorted.
diagram
poorly sorted
well sorted

9. graded bedding
a layer of sediments where the sediment size decreases from the bottom to the top.
diagram

10. River enters the Ocean Velocity decreases.
Big sediments are deposited first (close to shore).
Fine sediments are deposited last (far from shore).

11. sand dunes wind deposits material in mounds.
gentle slope facing into the wind..
steeper slope on the leeward side.
sand dunes migrate in the direction the wind is blowing.
DRAW EXAMPLE

12. diagram
Wind direction
Dune migration

14. Sand dunes in the Gobi Desert

15. Great Sand Dunes, Colorado

16. sand pedestal