Glaciers. What is a glacier?  Glacier- A large moving mass of snow and ice.

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Presentation transcript:

Glaciers

What is a glacier?  Glacier- A large moving mass of snow and ice

Where are glaciers found?

How are glaciers formed?  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 becomes packed  As its packed, it turns to ice

Pressure and Gravity  As more snow falls, glaciers become thicker and heavier  Gravity pulls glaciers downward with great pressure against the ground

Movement  Glaciers move very slowly  Glaciers slide, or creep over the ground

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

Calving

Crevasses  As Glaciers move, the ice on top bends and cracks  These cracks are called Crevasses

Crevasses

Glacier Snout  Front end of a glacier. Also called the terminus.

Erosion  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

Erosion

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

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

Icebergs

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

Calving of a Glacier

Melting Glaciers

Glacier 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 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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Picture References  paper/Landscapes/Iceberg.jpg paper/Landscapes/Iceberg.jpg   om/data/wximagenew/a/anghy85/465.jpg&imgrefurl= derground.com/blog/mitzy259/comment.html%3Fentrynum%3D1%26t stamp%3D200607&usg=__lnlvCzs83BsZlOsYEUlYGvU95IY=&h=449&w =640&sz=152&hl=en&start=4&sig2=0g7VCNl-ZFNPQbL- aVRMMQ&um=1&tbnid=iWIduoGdOWAtJM:&tbnh=96&tbnw=137&ei= Rk0nSeysPIOs8ASo5riBAw&prev=/images%3Fq%3Dparts%2Bof%2Ba %2Bglacier%26um%3D1%26hl%3Den%26rlz%3D1T4DKUS_enUS252 US253%26sa%3DN   paper/Landscapes/Iceberg.jpg paper/Landscapes/Iceberg.jpg   om/data/wximagenew/a/anghy85/465.jpg&imgrefurl= derground.com/blog/mitzy259/comment.html%3Fentrynum%3D1%26t stamp%3D200607&usg=__lnlvCzs83BsZlOsYEUlYGvU95IY=&h=449&w =640&sz=152&hl=en&start=4&sig2=0g7VCNl-ZFNPQbL- aVRMMQ&um=1&tbnid=iWIduoGdOWAtJM:&tbnh=96&tbnw=137&ei= Rk0nSeysPIOs8ASo5riBAw&prev=/images%3Fq%3Dparts%2Bof%2Ba %2Bglacier%26um%3D1%26hl%3Den%26rlz%3D1T4DKUS_enUS252 US253%26sa%3DN 