14) A major sheet of glacial outwash gravel (useful material for road constructi

Question

14) A major sheet of glacial outwash gravel (useful material for road construction, etc.) occurs in the Halifax region. Is this outwash on the East (Dartmouth side) or West (Halifax side) of the Harbour?1 pt) ng by the general shape and orientation of drumlins in the Halifax region, ice that flowed here during the last ice age (~15,000 years ago) was moving in the following direction: (1 pt a) southwest to northeast; b) northwest to southeast; c) north to south 16) If looking for well-sorted gravel to use for road construction, would you seek glacial landforms that look like a) a sinuous winding ridge; or b) a big U, such as is formed at the snout of a flowing glacier? (1 pt) 17) True or False: If you fall into a crevasse, you probably won't stop until you hit bedrock at the base of the glacier. (2 pts)

Explanation / Answer

14) The sheet of glacial outwash gravel at Halifax must have been from the last glacial maximum when ice sheets extended to about 45th parallel North. Since the Eastern side of the harbour (Dartmouth side) is at the 45th parallel and is nearer to the North Pole, the outwash must be on the Eastern side.

15) b) Northwest to South East

This is true for most of the Nova Scotia drumlins though there exists a debate in the literature about the timings.

16) a) a sinuous winding ridge

In a big U, the gravels are poorly sorted.

17) False

The change in velocity of the flowing ice due to uneven bedrock causes the fractures known as crevasses. However, since the ice is in continuous motion it does not allow the fracture to reach to bedrock. There is no discontinuity. The depth of the crevasse depend on the temperature and other factors and do not usually cross 25-30 m in temperate regions.

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