Earths land surface during an ice age

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Reference no: EM13322068

1-When a valley glacier retreats, ice flow within the glacier ________.

a. continues to move forward toward the downstream terminus of the glacier

b. begins to move upstream toward the head of the glacier

c. stops and becomes stagnant as ice at the terminus melts

d. is all focused upward as ice at the terminus melts

e. none of the above

2-One million years ago ice sheets covered much of the Earth’s land surface during an ice age. How did this affect the salinity of the oceans?

a. Oceans were less salty than today

b. Oceans were saltier than today

c. Ocean salinity was the same as today

d. None of the above

3. Suppose that a glacier in Alaska receives record snowfall for 10 years in a row. How is this glacier likely to be affected?

a. The flux of ice into the glacier would be less than the flux out, therefore its terminus would recede.

b. Ablation would increase to balance increased snow accumulation, keeping the glacier in equilibrium.

c. The snowline (i.e. equilibrium line) would move further up the glacier.

d. The flux of ice into the glacier would be more than the flux out, therefore its terminus would advance.

Reference no: EM13322068

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