Glaciers Chapter 3 Section 4. Standards  S 6.2a Surface water flow, glaciers, wind, and ocean waves have all been and continue to be active throughout.

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Presentation transcript:

Glaciers Chapter 3 Section 4

Standards  S 6.2a Surface water flow, glaciers, wind, and ocean waves have all been and continue to be active throughout California and the rest of the world in shaping landscapes.

Anticipatory Set

Vocabulary  Glacier  Continental glacier  Ice age  Valley glacier  Plucking  Till  Moraine  Kettle

How Glaciers form and Move  2 types of glaciers.  Continental glaciers – covers most of a continent or large island.  Valley glaciers- long, narrow glacier that forms when snow and ice build up.  Glaciers have been found in Antarctica and Greenland.  They flow in all directions

Valley/ Continental Glacier

Glaciers (Input)  Glaciers will advance, retreat, or melt back.  Glaciers can only form in an area where more snow falls than melts. Gravity will begin to pull down the glacier.  They move a few centimeters a day.

Glaciers (Input)  2 processes that glaciers erode the land are plunking and abrasion  Plunking- as it moves across the land, it picks up rocks. It can even move large boulders.  Abrasion: gouges and scratches the bedrock.  A U shaped valley will be created that demonstrates that a glacier once covered the area.

Glaciers (Input)  When a glacier melts, it deposits the sediment it eroded from the land, creating various landforms.  If the sediment has been deposited directly on the surface it is called till.  The till deposited on the edges of a glacier forms a ridge called a moraine.  Terminal Moraine: the ridge of till at the farthest point reached by a glacier.

Terminal Moraine

Kettle  A kettle is a small depression that forms when a chunk of ice is left is left in glacial till.

Checking for Understanding  What is a continental glacier?  What is a valley glacier?  How does a glacier form?  How does a glacier move?

Guided Practice Independent Practice  Guided Practice: page # 1-22  Independent Practice: Glacier Worksheet