GlaciersGlaciers

What is a glacier?What is a glacier?Glacier- A

large moving mass of snow and ice

Glacier- A large moving mass of snow and ice

Where are glaciers found?Where are glaciers found?

How are glaciers formed?How are glaciers formed?Snow falls

on the side of a mountain and begins to collect

Snow falls on the side of a mountain and begins to collect

As more and more snow piles up, it creates pressure

The snow is packed down into ice and accumulates as a large sheet of ice

As more and more snow piles up, it creates pressure

The snow is packed down into ice and accumulates as a large sheet of ice

Snow into Ice

Snow into Ice

Snow becomes packedAs its packed, it turns to ice

Snow becomes packedAs its packed, it turns to ice

Pressure and GravityPressure and GravityAs more snow

falls, glaciers become thicker and heavier

Gravity pulls glaciers downward with great pressure against the ground

As more snow falls, glaciers become thicker and heavier

Gravity pulls glaciers downward with great pressure against the ground

MovementMovement

Glaciers move very slowlyGlaciers slide, or creep

over the ground

Glaciers move very slowlyGlaciers slide, or creep

over the ground

CalvingCalving

Calving occurs when pieces of a tidewater glacier break off and fall into the sea

CalvingCalving

CrevassesCrevasses

As Glaciers move, the ice on top bends and cracks

These cracks are called Crevasses

As Glaciers move, the ice on top bends and cracks

These cracks are called Crevasses

CrevassesCrevasses

CrevassesCrevasses

Glacier SnoutGlacier Snout

Front end of a glacier. Also called the terminus.

Front end of a glacier. Also called the terminus.

ErosionErosion

As Glaciers move, they pick up debris

Stones and boulders are picked up and carried along

Using these stones and their weight, glaciers grind and carve the landscape

As Glaciers move, they pick up debris

Stones and boulders are picked up and carried along

Using these stones and their weight, glaciers grind and carve the landscape

ErosionErosion

ErosionErosion

ErosionErosion

A glaciated valley in the Mount Baker-Snoqualmie National Forest showing the characteristic U-shape and flat bottom.

A glaciated valley in the Mount Baker-Snoqualmie National Forest showing the characteristic U-shape and flat bottom.

ErosionErosion The Llanberis Pass in Snowdonia National Park, north Wales, is typical of a U-shaped valley formed by glacial erosion.

The Llanberis Pass in Snowdonia National Park, north Wales, is typical of a U-shaped valley formed by glacial erosion.

IcebergsIcebergs

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

IcebergsIcebergs

Most of the icebergs are found under water, making them very dangerous to ships.

Calving of a Glacier

Melting Glaciers

Glacier FunGlacier Fun

When glaciers melt they deposit materials, creating terminal moraines

Let’s see if we can use a model to show what this looks like.

Read C10 on Terminal Moraines

When glaciers melt they deposit materials, creating terminal moraines

Let’s see if we can use a model to show what this looks like.

Read C10 on Terminal Moraines

Terminal MorainesTerminal Moraines

A massive terminal moraine marks the greatest advance of a glacier, during the last centuries, in Cordillera Huyhuash, Peru. A lake has formed between the terminal moraine and the glacier

front. The tall peak is Nevado Yerupaja. Photo J. Alean 1979.

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