erosion and deposition 6 th grade earth science october 2012
TRANSCRIPT
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Erosion and Deposition
6th Grade Earth Science
October 2012
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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 …
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What is Erosion?
Erosion is the movement of sediment by wind, ice,
water, or gravity.
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What is Deposition?
The dropping of sediment out of the wind, water, ice, or gravity and
settling in a new place.
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Gravity
Sediment falls
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Gravity ErosionAngle of Repose is the steepest angle, or
slope at which a material will not slide down.
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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
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What type of mass movement is each picture?http://classes.colgate.edu/dkeller/geol101/massw/mass.htm
LANDSLIDE MUDFLOW
SLUMP CREEP
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IceIce (glaciers) carry sediment.
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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
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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
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Which type of glacier or landform is represented in each picture?www.uwsp.edu/.../lecture_glacial_processes.html
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3 4
Continental Glacier Alpine Glacier
Kettle U Shaped Valley
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What did glaciers create in each picture?
Outwash PlainSoutheast, Alaska
MoraineThompson Glacier,
Canadian Arctic
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Wind
Wind blows sediment after it is weathered.
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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
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Water
Water (rivers, oceans, rain, etc.) washes sediment after being
weathered
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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
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What did water erosion create in each of these pictures?
SEA CAVE
SEA STACKS
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53 SEA ARCH
SEA CLIFFS
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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
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What did water create in each of these pictures?
DELTA SANDBAR
ALLUVIAL FAN
http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21604
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BEACH