WHAT DO YOU ALREADY KNOW ABOUT THEM ? ANSWER TRUE OR FALSE.
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![Page 1: WHAT DO YOU ALREADY KNOW ABOUT THEM ? ANSWER TRUE OR FALSE.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649eb25503460f94bb86db/html5/thumbnails/1.jpg)
WHAT DO YOU ALREADY KNOW ABOUT THEM?ANSWER TRUE OR FALSE.
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WHAT DO YOU ALREADY KNOW ABOUT THEM?ANSWER TRUE OR FALSE.1. Glaciers are made of ice.
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WHAT DO YOU ALREADY KNOW ABOUT THEM?ANSWER TRUE OR FALSE.1. Glaciers are made of ice.2. Glaciers can only be formed during the ice ages.
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WHAT DO YOU ALREADY KNOW ABOUT THEM?ANSWER TRUE OR FALSE.1. Glaciers are made of ice.2. Glaciers can only be formed during the ice ages.3. Due to global warming, all glaciers have melted.
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WHAT DO YOU ALREADY KNOW ABOUT THEM?ANSWER TRUE OR FALSE.1. Glaciers are made of ice.2. Glaciers can only be formed during the ice ages.3. Due to global warming, all glaciers have melted.4. Glaciers are capable of moving.
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A large mass of ice that moves slowly over land.
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2 KINDS OF GLACIERS
VALLEY GLACIER
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2 KINDS OF GLACIERS
VALLEY GLACIER CONTINENTIAL GLACIER
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow
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TWIN GLACIERIN ALASKA
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys• Found on high
mountains
CONTINENTIAL GLACIER
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys• Found on high
mountains
CONTINENTIAL GLACIER
• Covers much of continent or large island.
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys• Found on high
mountains
CONTINENTIAL GLACIER
• Covers much of continent or large island.
• Larger than valley glacier
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys• Found on high
mountains
CONTINENTIAL GLACIER
• Covers much of continent or large island.
• Larger than valley glacier• Spread out over large areas
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GLACIER IN ICELAND
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2 KINDS OF GLACIERS
VALLEY GLACIER• Long & Narrow• Form when snow &
ice build up in high mountain valleys
• Move down valleys• Found on high
mountains
CONTINENTIAL GLACIER
• Covers much of continent or large island.
• Larger than valley glacier• Spread out over large areas• Cover 10% of Earth’s
surface
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GLACIERSIN THE UNITEDSTATES
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Ice Sheet on Ellesmere Island, CanadaPhoto credit: Geological Survey of Canada
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How do glaciers form?
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How do glaciers form?
• Form when more snow falls than melts
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How do glaciers form?
• Form when more snow falls than melts
• Snow builds up year after year
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How do glaciers form?
• Form when more snow falls than melts
• Snow builds up year after year
• Pressure compacts the snow to ice at the bottom
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How do glaciers form?
• Form when more snow falls than melts
• Snow builds up year after year
• Pressure compacts the snow to ice at the bottom
• At 30-40 meters high gravity begins to pull it down hill
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GLACIERS MOVE!
VALLEY GLACIERS
CONTINENTAL GLACIERS
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GLACIERS MOVE!
VALLEY GLACIERS• A few centimeters to
a few meters per day
CONTINENTAL GLACIERS•
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GLACIERS MOVE!
VALLEY GLACIERS• A few centimeters to a
few meters per day• Can suddenly slip
quickly-- called a surge
CONTINENTAL GLACIERS
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GLACIERS MOVE!
VALLEY GLACIERS• A few centimeters to a
few meters per day• Can suddenly slip
quickly-- called a surge• Suring glaciers can move
6 km/ year
CONTINENTAL GLACIERS
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GLACIERS MOVE!
VALLEY GLACIERS• A few centimeters to a
few meters per day• Can suddenly slip
quickly-- called a surge• Suring glaciers can move
6 km/ year
CONTINENTAL GLACIERS• Can flow in all directions• Spread out like pancake
batter in a frying pan
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GLACIERS MOVE!
VALLEY GLACIERS• A few centimeters to a
few meters per day• Can suddenly slip
quickly-- called a surge• Suring glaciers can move
6 km/ year
CONTINENTAL GLACIERS
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QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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The front of the surging glacier.
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The fractured and surging Bering Glacier in Alaska, Oct. 1993, Chugach
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GLACIAL EROSIONGlaciers can erode the land
By PLUCKING• As the glacier forms
rocks stick to the bottom.
• As the glacier moves it carries the rocks along with it.
• Scratching can occur along the way.
Bedrock
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PLUCKING
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HOW DOES PLUCKING HAPPEN?
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GLACIAL DEPOSITION
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GLACIAL DEPOSITIONAs a glacier melts it deposits the sediment it eroded
from the land creating various landforms.
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GLACIAL DEPOSITIONAs a glacier melts it deposits the sediment it eroded
from the land creating various landforms.
•Till is the mixture of sediments that a glacier deposits on the surface.
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GLACIAL DEPOSITIONAs a glacier melts it deposits the sediment it eroded
from the land creating various landforms.
•Till is the mixture of sediments that a glacier deposits on the surface.
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GLACIAL DEPOSITIONAs a glacier melts it deposits the sediment it eroded
from the land creating various landforms.
•Till is the mixture of sediments that a glacier deposits on the surface.•Moraine is the till deposited at the edges of a glacier that forms a ridge.
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GLACIAL DEPOSITIONAs a glacier melts it deposits the sediment it eroded
from the land creating various landforms.
•Till is the mixture of sediments that a glacier deposits on the surface.•Moraine is the till deposited at the edges of a glacier that forms a ridge.
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GLACIAL DEPOSITIONStill more glacial sediments.
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GLACIAL DEPOSITIONStill more glacial sediments.
•Prairie potholes are shallow depressions in till that were formed by flowing water at the continental glacier melted.
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GLACIAL DEPOSITIONStill more glacial sediments.
•Drumlin is a longmound of till that is smoothed in thedirection of the glacier’s flow. This happened asice slid over a moraine.
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GLACIAL DEPOSITIONStill more glacial sediments.
•GLACIAL LAKESGlaciers may leave behind large lakes in long basins eroded by plucking and abrasion.
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GLACIAL DEPOSITIONStill more glacial sediments.
•Glacial horn form asglaciers carve away the sides of a mountain, the result is a horn, a sharpened peak.
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GLACIAL DEPOSITIONStill more glacial sediments.
•Glacial horn form asglaciers carve away the sides of a mountain, the result is a horn, a sharpened peak.
HORN
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GLACIAL DEPOSITIONStill more glacial sediments.
•CIRQUE is a Bowl-shapedhollow eroded by a glacier.
HORN
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GLACIAL DEPOSITIONStill more glacial sediments.
•CIRQUE is a Bowl-shapedhollow eroded by a glacier.
HORNCIRQUE
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GLACIER REVIEW• How are valley
glaciers & continental glaciers different?
• What are two types of glacial erosion?
• Describe three features formed by glacial deposition.