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Question: 1 which factor determines whether a glacier will form in...

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1. Which factor determines whether a glacier will form in a particular area:

The area must be below freezing most of the year

The area must receive substantial precipitation

The area must be at high altitude

Annual snow accumulation must exceed annual snow melt over a multi-year period

2. The most recent episode of widespread continental glaciation ended about

200,000 years ago

20,000 years ago

2,000 years ago

200 years ago

3. Taken together, the Greenland and Antarctic ice sheets cover an area as big as

Texas

the United States

the United States and India combined

bigger than the United States and India combined

4. Based on recent studies of glacial melting, what is the best estimate of associated sea level rise by the year 2100?

1-2 meters

2-20 meters

20-40 meters

more than 40 meters

5. If the polar ice sheets melt completely, Brooklyn would become covered by the ocean

True

False

6. Glaciers are made of solid ice but they flow like fluids. One mechanism for glacial flow is

Ice is continuously melting and refreezing within the glacier, parts of which flow when liquid

Glaciers terminate in the ocean and break into pieces, creating a pull on the rest of the glacier

Under pressure of tons of ice, chemical bonds between ice molecules break, allowing ice to flow in a solid state

Large fractures in the glacier create space which is automatically filled by ice

7. Liquid water is found at the base of glaciers because

The temperature is above 0 degrees C there

Any water in the glacier naturally percolates to the bottom

High pressure there lowers the freezing point of water

Sub-glacial volcanoes release water vapor which condenses in contact with the glacier

8. We can tell that ice-free areas once were covered by glaciers because

We observe parallel striations on exposed bedrock

We observe U-shaped valleys

We observe glacial erratics

We observe hanging valleys

Any of the above

2 and 3 only

9. The material transported by glaciers may be described as

Mostly sand

Mostly giant boulders

A heterogeneous mixture of rock fragments

Mostly rock flour, a very fine sediment

10. The surface of northern Long Island is composed of

Unsorted glacial till

Well-sorted glacial sand

Unconsolidated Cretaceous-age clay

Very large glacial erratics

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