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Glaciers images

Glaciers

 

 

The largest reservoir of fresh water on Earth is:

                Glaciers!

 

What is a glacier?

What types are there?

What are the features of glaciers?

How do they alter the landscape?

 

 

Glaciers form anywhere that there is snow and temperatures that rarely get above freezing.  

Here on Earth the two places that fit those criteria are high altitudes and high latitudes (mountain tops and near the poles).

Glaciers in the high altitude are called alpine glaciers.

Image result for alpine glacier

Image result for alpine glacier

Image result for alpine glacier

Image result for alpine glacier

Some of those features were:

Cirques are circular birthing places of glaciers.

Crevasses are where glaciers go over a drop (sort of an glacier waterfall).  They are deep breaks in the ice and very dangerous.

Moraines are piles of debris pushed by the glaciers.

There are terminal moraines at the end of the glaciers reach.

There are lateral moraines at the edge of the glacier (from the mountains)

There are medial moraines where two glaciers come together and their lateral moraines combine.

 

Features on the glacier itself include:

Image result for alpine glacier crevasse

Crevasses

Image result for alpine glacier cirque

Cirques

Medial and terminal moraine

 

Alpine glaciers are meters thick, found in high elevations, and travel downhill.

They can be found anywhere in the world if you go high enough.

Image result for alpine glacier latitude, altitude

So you can find alpine glaciers at the equator if you have a tall enough mountain.  At the poles, you needn't have any elevation.

 

Effects of an alpine glacier include:

Horns are pointy mountain tips where three or more circques come together.

Aretes are ridges that glaciers carved out on either side (U-shaped on both sides)

Tarns are lakes in the hollow left by a cirque.

Cols are low spots in aretes.

U-shaped valleys are made by the moving glacier and creates fjords.

Image result for effects of alpine glacier, tarn, col, arete, horn

Arete:

Image result for effects of alpine glacier, tarn, col, arete, horn

Horn:

Image result for effects of alpine glacier, horn

Tarn:

Image result for effects of alpine glacier, tarn

U-shaped valley:

Image result for effects of alpine glacier, u shaped valley

Fjords:

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Continental glaciers:

Image result for continental glacier

These are kilometers thick, found at high latitudes, and travel towards the equator.

 

 

Continental glaciers flatten everything.  They leave behind interesting features:

Image result for continental glacier

Image result for continental glacier

Some of those features are:

Esker

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U-shaped valley (see above)

Drumlin

Image result for esker

Kettle pond

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Kame

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Filled in E-W rivers

Deeply dug N-S rivers

Rebound

Image result for glacial rebound

Striations in bedrock

Image result for glacial striations

erratics

Image result for glacial erratic

Moraines:

Image result for glacial moraine

 

 

 

The continental glacier that once covered us:

Image result for continental glacier that covered north america

Image result for continental glacier that covered north america

 

The temperature:

Image result for temperature, ice ages

Image result for temperature, ice ages

 

What caused it?:

Image result for temperature, ice ages

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