§2.2: Rivers of ice part 1

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§2.2 Rivers of ice part 1

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Question 8

Erosion by ice

Erosion by wind

Erosion by water

Chemical weathering

Mechanical weathering

Erosion

Weathering

Erosion and weathering

Chapter 2 paragraph 2

1. What do you see?

2. Where did they take the photo?

Glacier

Glaciers =  rivers of ice moving slowly downhill

By thawing and freezing again and again the snow changes in time into firn: grainy, icy snow left over from previous seasons. 

Firn piles up in low-lying places high in the mountains to form firn basins, the beginning of what will be a glacier.

Ice-age/Glacial-age

Thousands of years ago, the Alps were completely filled with glaciers

Glacial: Cold period during which the earth's average temperature drops a few degrees and extensive ice sheets form on land. Also called ice age

The remains of Glaciers

The glacier took with it not only ice, but also weathering material (see photo).

We can still see this material in the places where there used to be a glacier.
We call this moraines

Moraines

Glacial debris surrounding a glacier.
    Lateral moraines
    Ground moraines
    Terminal moraines

What do moraines have to do with the Netherlands?

There used to be ice in the Netherlands, too, and it left debris. You can still find the boulders in many places.

During ice age, ice from Scandinavia pushed into the Netherlands.

What did the Netherlands look like during the ice age?

https://schooltv.nl/video/hoe-zag-nederland-eruit-in-de-ijstijd-bedekt-door-gletsjers-uit-scandinavie/

Ice-ages

glacial = period when the average temperature dropped by 5 degrees

 

interglacial = period between glacials in the ice age?

Let's go to work!

You may work on part 1 of the homework assignments:

§2.2: assignments 1 to 5

This is homework for next Monday!

Finished? Make assignments §2.2 6 to 10