erosion & glaciers
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Erosion & Glaciers. World Geography 3200/3202 October 2010. Glaciers Introduction. In this lesson you will: 1.4.1 Define the terms outwash plain, terminal moraine, erratic, drumlin, and esker. (k) 1.4.2 Examine evidence for the direction of movement of a continental glacier. (a) - PowerPoint PPT PresentationTRANSCRIPT
Glaciers IntroductionIn this lesson you will: 1.4.1 Define the terms outwash plain,
terminal moraine, erratic, drumlin, and esker. (k)
1.4.2 Examine evidence for the direction of movement of a continental glacier. (a)
1.4.3 Define the terms cirque, arête, hanging valley, lateral moraine, and terminal moraine. (k)
1.4.4 Define the term fiord. (k)
Continental vs. AlpineContinental glaciers : Glaciers that cover
parts of continental land masses like Greenland & Antarctica
Alpine glaciers : Glaciers that are found high in mountain valleys, above the snow-line
Continental vs. Alpine: Differences
Location; Alpine glaciers are only found on mountain tops whereas continental glaciers are only found at the earth's poles regardless of elevation.
Size; Alpine glaciers are smaller compared to Continental glaciers.
Alpine GlaciersAlpine glaciers are like very slow moving
rivers of ice flowing down high mountain valleys
They typically erode the mountain beneath them into a u-shaped valley with steep sides.
Some alpine or valley glaciers are 1000m thick and up to 160 km long, though most are only a few km in length.
Continental vs. Alpine: Similarities
Both move and cause erosion (gravity & friction)
Both change the landscape by weathering & deposition
Both create land forms Both developed in constantly cold
temperatures below freezing. (< 0)
Video Overview
Features of Continental GlaciersUse your textbook to create profiles of the
following concepts related to continental glaciersoutwash plainterminal moraineErraticDrumlinesker
Features of Alpine GlaciersUse your textbook to create profiles of the
following concepts related to alpine glaciersCirqueArêtehanging valleylateral moraineterminal morainefiord
Evidence of Glacier MovementThe gently-sloped end of drumlins point in
the direction of glacier movement. The terminal moraine marks the furthest
extent of the glacier. The layers of silt in an outwash plain can
indicate direction of glacier movement. (fine particles would be at the leading edge while larger particles would have been closer to the glacier)
Review ActivitiesAssigned Readings"Glaciers as Agents of Erosion" on pages 32-
34 of your text book. Assigned ActivitiesComplete Question # 12 on page 33 of your
text book.
Review QuestionsWhere are continental glaciers found?
Where are alpine glaciers found?
Many land forms are created by continental glaciers. Which one is very similar to a river delta?
Many land forms are created by continental glaciers. Which one is created by a river running under the glacier?
Review QuestionsMany land forms are created by continental
glaciers. Which one is a large boulder that looks out of place in its surroundings?
Many land forms are created by continental glaciers. Which one marks the furthest extent of the glaciers movement?
Many land forms are created by continental glaciers. Which one is an egg-shaped hill?
Which end of a drumlin indicates the direction of glacier motion?
Review QuestionsWhere are continental glaciers found? THE
POLES OF EARTH Where are alpine glaciers found? HIGH IN
MOUNTAIN VALLEYS Many land forms are created by continental
glaciers. Which one is very similar to a river delta? OUTWASH PLAIN
Many land forms are created by continental glaciers. Which one is created by a river running under the glacier? ESKERS
Review QuestionsMany land forms are created by continental
glaciers. Which one is a large boulder that looks out of place in its surroundings? ERRATICS
Many land forms are created by continental glaciers. Which one marks the furthest extent of the glaciers movement? TERMINAL MORAINE
Many land forms are created by continental glaciers. Which one is an egg-shaped hill? DRUMLIN
Which end of a drumlin indicates the direction of glacier motion? POINTY
Alpine GlaciersAlpine glaciers are like very slow moving
rivers of ice flowing down high mountain valleys
They typically erode the mountain beneath them into a u-shaped valley with steep sides.
Some alpine or valley glaciers are 1000m thick and up to 160 km long, though most are only a few km in length.
Features of Alpine GlaciersUse your textbook to create profiles of the
following concepts related to alpine glaciersCirqueArêtehanging valleylateral moraineterminal morainefiord
Review ActivitiesAssigned Readings
"Alpine Glaciation" on pages 34-36 of your text book.
Assigned ActivitiesDo Question # 14 on page 36.
Review QuestionsWhat alpine glaciation feature consists of a circular
hollow cut into the bedrock.
What alpine glaciation feature consists of a knife-like edge between adjacent cirques?
What alpine glaciation feature consists of a valley that abruptly ends as the main valley is at a much lower level?
What alpine glaciation feature consists of deposits along the side of the glacier.
What alpine glaciation feature is formed when a valley
glacier reaches the ocean and eventually melts back.
Review QuestionsWhat alpine glaciation feature consists of a
circular hollow cut into the bedrock. CIRQUE What alpine glaciation feature consists of a knife-
like edge between adjacent cirques? ARETE What alpine glaciation feature consists of a valley
that abruptly ends as the main valley is at a much lower level? HANGING VALLEY
What alpine glaciation feature consists of deposits along the side of the glacier. LATERAL MORAINE
What alpine glaciation feature is formed when a valley glacier reaches the ocean and eventually melts back. FJIORD