Glaciation

What is plucking?

• When a glacier scours the valley floor.

• When the snout of the glacier pushes deposited sediment.

• When rocks become frozen into glacier and are plucked out when the glacier moves.

• When frozen water expands and forces cracks in rocks to get bigger and break apart.

What is a glacier?

• A glacier is any piece of ice that moves.

• A glacier is a mass of ice that thaws and re-freezes repeatedly.

• To be considered a glacier, a mass of ice must be at least 1 mile thick

• Glaciers are masses of ice made made up of snow that has accumulated and compacted over time .

What are the two main types of glacial erosion?

• Abrasion and plucking
• Plucking and freeze-thaw
• Chemical and biological
• Abrasion and hydraulic action

Which letter represents the shape of valleys created by glaciers?

• V

• U

• W

• L

Abrasion is:

• parallel and straight scratches cut into bedrock by a glacier.

• a process of erosion which occurs when material being transported wears away at a surface over time.

• the transportation of large rocks and boulders

• a ridge at the edge of a glacier where rocks and sediment are deposited

Large rocks or boulders that are transported by glaciers are called...

• striations

• erratics

• till

• abrasions

Identify the glacial landforms created by deposition:

• arête

• till

• ice

• moraine

What is this glacial feature called?

• Hanging Valley

• Corrie

• Glacial Trough

• Waterfall

Name this landform

• Corrie

• Backwall

• Arete

• Scree

A _____ is a tear-drop-shaped hill created by ice flow over and around till deposit.

• drumlin
• esker
• moraine
• erratic