1. III. Deposition-the process by which sediments
are released, settled from or
dropped from an erosional
system.
It occurs when the
velocity or speed of an erosional
agent slows down.

2. A. Factors Affecting Deposition
1. Velocity of the Transporting Agent.
The faster the transporting agent,
the larger the particles it can carry.
b. As the velocity decreases, the
sediments are deposited, larger
on the bottom, smaller on top.
c. The smallest particles tend to remain
in suspension for a long time.

3. Rounder particles(less surface area)
2. Shape of the sediment
Rounder particles(less surface area)
settle faster than flatter particles
in water. b.
Settling Rate

4. 3. Density of the sediment. Denser particles will settle faster
than less dense particles. b.
Settling Rate
Density

5. B. Depositional Features
1. From Gravity:
a. Talus cone-
sediment that is
found at the
base of a hill or
mountain.

6. 2. From Running Water and Wave Action
a. Sandbars-a build-up of sediment by
wave action

7. b. Deposition takes place on the side of the groin that the long-shore
current is coming
from.
Longshore current
Sand is trapped
by the jetty(groin).

8. c. Delta:fan-shaped deposit of sediment at
the mouth of
a river.
Nile River Delta

9. d. Sediment deposits are sorted.
Horizontal Sorting-
occurs when a stream enters a lake; as the stream velocity decreases, the larger, rounder, and high density sediments are deposited near the mouth of the stream.

10. Horizontal Sorting

11. Vertical Sorting or Graded Bedding-
results when a sediment-laden current
slows, particles are deposited.

12. 3. From Wind
a. Sand Dunes-the gentle slope faces the
direction the wind comes from.
wind

13. Draw a sand dune:

14. deposits caused by varying wind direction.
b. Deposits are sorted sediments, as the wind slows, the larger sediments are on the bottom, smaller on top.
c. Cross-bedding-
diagonal sand
deposits caused by varying
wind direction.
Checkerboard Mesa, Zion National Park

15. 4. From Glaciers
Till(drift)-unsorted sediments
deposited by the glacier.
Moraine-till found along the sides
or leading edge of the glacier.

16. b. Drumlins-elongated hills sculpted by a glacier’s retreat; they indicate the direction
of flow. S N

18. c. Eskers-are long, winding ridges of sand
and gravel typically oriented parallel to ice flow.
They were deposited by glacial melt water,
streams, flowing in channels or tunnels beneath
the ice.

19. d. Kames-
mounds or hills are created when
drift fills a hole in a glacier.
When the glacier recedes the
mound is left behind.

20. e. Kettle Lakes-formed when large blocks of ice
break from the face of the glacier and are
buried in sediment. When these blocks melt,
they leave circular depressions.

21. f. Erratics-large boulders that were deposited when the glacier
melted. .
NYC-Central Park

22. g. Outwash Plain-melt water that washes
out from under the glacier carrying
sediments. Sorting will occur with a
decrease in velocity of the water.