erosion and deposition 6 th grade earth science october 2012
TRANSCRIPT
Erosion and Deposition
6th Grade Earth Science
October 2012
Who is a 1 and who is a 2?
Turn to your partner and share with them the following: What is your favorite book and why?
If you are closest to my favorite book you are a 1, etc.
My favorite book is …
What is Erosion?
Erosion is the movement of sediment by wind, ice,
water, or gravity.
What is Deposition?
The dropping of sediment out of the wind, water, ice, or gravity and
settling in a new place.
Gravity
Sediment falls
Gravity ErosionAngle of Repose is the steepest angle, or
slope at which a material will not slide down.
Gravity DepositionMass Movement
gravity moves material down a slope
1. Landslide - rock & soil quickly
a. Slump – rock & soil suddenly fall, big mass
2. Creep – slow, down movement of rock/ soil.
3. Mudflow - mud
4. Avalanche - snow
What type of mass movement is each picture?http://classes.colgate.edu/dkeller/geol101/massw/mass.htm
LANDSLIDE MUDFLOW
SLUMP CREEP
1 2
3 4
IceIce (glaciers) carry sediment.
Ice ErosionContinental Glaciers – covers continent.
Flattens / smoothes landKettle Lakes
Alpine Glacier – in the mountains. Land made rugged.
Horns – sharp pyramid shaped peaks
U-Shaped Valleys
Ice DepositionTills – unsorted, deposited rock material
Moraines – ridges along edge of glacier
Stratified Drift – layers of rock deposited based on size
Outwash plain – large area of drift
Which type of glacier or landform is represented in each picture?www.uwsp.edu/.../lecture_glacial_processes.html
1 2
3 4
Continental Glacier Alpine Glacier
Kettle U Shaped Valley
2
3
4
1
What did glaciers create in each picture?
Outwash PlainSoutheast, Alaska
MoraineThompson Glacier,
Canadian Arctic
1 2
Wind
Wind blows sediment after it is weathered.
Wind Deposition Sand Dunes – mounds of wind deposited
sand. Move in direction of wind.
Loess – thick deposits of fine-grained, wind blown sediment
http://www.nwlg.org/pages/resources/geog/hydro_cycle/dunes/stop7b.htm
Water
Water (rivers, oceans, rain, etc.) washes sediment after being
weathered
Water Erosion Sea Cliffs – rock wears away
Sea Caves – hole in rock created by waves near cliff
Sea Arches – waves cut hole completely through rock in a sea cave
Sea Stacks – offshore column of rock once connected to the mainland
What did water erosion create in each of these pictures?
SEA CAVE
SEA STACKS
12
4 4 6
1 2
5
53 SEA ARCH
SEA CLIFFS
1
2
3
4
Water Deposition Deltas – slow river current drops sediment in fan-shaped
pattern at end of river
Sand Bars – offshore deposit of sand, gravel, or shell material
Alluvial Fans
Beaches – deposited sand
What did water create in each of these pictures?
DELTA SANDBAR
ALLUVIAL FAN
http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21604
1
2
4 4 6
1 2
4
53
BEACH