6.2: Glacial Deposition, landforms and landscapes

Question 1

Name this glacial depositional feature by its description

oval-shaped hills, largely composed of glacial drift, formed beneath a glacier or ice sheet and aligned in the direction of ice flow

Answer 1

Drumlins

Question 2

Name the 2 places where moraines form

Answer 2

1. sub glacially
2. along the margins of a glacier (ice-marginal)

Question 3

Name the Moraine by its description

A ridge of moraine along the edge of the valley floor

Answer 3

Lateral Moraine

Question 4

Name the Moraine by its description

A ridge of moraine down the middle of the valley floor

Answer 4

Medial Moraine

Question 5

Name the Moraine by its description

A ridge of moraine extending across the valley at the furthest point the glacier reached

Answer 5

Terminal Moraine

Question 6

Name the Moraine by its description

A series of ridges running across the valley behind the terminal moraine

Answer 6

Recessional Moraine

Question 7

Name the Moraine by its description

A ridge of moraine with stones tilted upwards

Answer 7

Push Moraine

Question 8

Name the Moraine by its description

Chaotic jumble of till mounds

Answer 8

Hummocky or disintegration moraine (non-linear)

Question 9

Name the Moraine by its formation

Exposed rock on the valley side is weathered and fragments fall down on to the edge of the glacier. This is then carried along the valley and deposited when the ice melts. Parallel to ice flow.

Answer 9

Lateral Moraine

Question 10

Name the Moraine by its formation

When two valley glaciers converge, two lateral moraines combine to form a medial moraine. Material is carried and deposited when melting occurs. Parallel to ice flow.

Answer 10

Medial Moraine

Question 11

Name the Moraine by its formation

Advancing ice carries moraine forward and deposits it at the point of maximum advance when it retreats. The up-valley (ice contact) side is generally steeper than the other side as the advancing ice rose over the debris. Transverse to ice flow.

Answer 11

Terminal or end moraine

Question 12

Name the Moraine by its formation

Each recessional moraine, and there may be many, represents a still-stand during ice retreat. They are good indicators of the cycle of advance and retreat that many glaciers experience. Transverse to ice flow.

Answer 12

Recessional Moraine

Question 13

Name the Moraine by its formation

Any morainic material at the glacier snout will be pushed forward during advance. The faster the velocity of advance, the steeper the angle of tilt or stones. Transverse to ice flow.

Answer 13

Push Moraine

Question 14

Name the Moraine by its formation

Originally considered a product of ice stagnation and dropped from a debris-rich glacier, now associated with active glacial retreat. Limited orientation.

Answer 14

Hummocky or disintegration moraine (non-linear)

Question 15

Describe the typical pattern of formation that Drumlins have

Answer 15

They usually range from 10 - 50 meters high and 20 to 2000 meters long

they usually occur in ‘swarms’

they are typically found in lowland areas

Question 16

Name this glacial depositional feature by its description

an extensive flat plain of glacial till that forms when a sheet of ice becomes detached from the main body of a glacier and melts in place, depositing the sediments it carried

Answer 16

Till Plain

Question 17

Name this glacial depositional feature by its description

it forms as a sheet of well-compacted sediment beneath a glacier, and ranges from several centimetres to many meters in thickness.

Answer 17

Lodgement Till

Question 18

Name this glacial depositional feature by its description

till was carried on or near the surface of the glacier and was let down as the glacier melted.

Answer 18

Ablation till

Question 19

What can be deduced from the shape and orientation of a drumline

Answer 19

The direction of ice flow