Depositional Landforms and Landscapes

Question 1

Ice contact deposition

Answer 1

When debris is deposited by the ice mass and not the meltwater.
During the warmer summer months, glaciers begin to melt and glacial till is deposited on the valley floor or sides of the moving glacier.
Till is unsorted, irregular debris ranging from clay to stones to boulders of any shape and size.
Features of ice contact deposition include erratics, moraines, and drumlins.

Question 2

Erratics

Answer 2

Random boulders of different sizes and types for the area they were found. No pattern to their deposition and look completely out of place on the landscape.
Glaciers pick up large rocks and carry them hundreds or thousands of kilometres away from where they originate. Erratics from Scandinavia have been found in boulder clay on the NE England coastline.
Carried deep in ice and do not erode the same as till at the edges of the glacier.

Question 3

Moraines

Answer 3

Unsorted glacial till that is deposited in mounds.

Question 4

Terminal moraines

Answer 4

Moraines deposited at the snout of the glacier.

Question 5

Lateral moraines

Answer 5

Material deposited along both sides of the glacier (edges).

Question 6

Medial moraines

Answer 6

Ridge of deposited material in the middle, where two glaciers meet and continue to flow downhill together.

Question 7

Ground moraine

Answer 7

Material dragged under the bas of the glacier and deposited over a wide area on the valley floor.

Question 8

Recessional moraine

Answer 8

Deposited material that show the point of glacial retreat.