Geomorphological Depositional Landforms

Question 1

What are the four geomorphological depositional landforms?

Answer 1

Drumlins, erratics, moraines, till plains.

Question 2

What is till?

Answer 2

Unsorted glacial material formed through erosion and weathering.

Question 3

How do till plains form?

Answer 3

When an ice sheet detaches and melts, depositing till on the valley floor.

Question 4

Where is till deposited from?

Answer 4

On top of and within the glacier.

Question 5

How long do till plains last?

Answer 5

A medium-long amount of time.

Question 6

What can disrupt till plains?

Answer 6

Meltwater, periglacial processes and weathering.

Question 7

What is an erratic?

Answer 7

A large boulder of a different rock type to surrounding rock.

Question 8

How are erratics transported?

Answer 8

Broken off by weathering and erosion, transported by a glacier and deposited elsewhere.

Question 9

When are erratics deposited?

Answer 9

When the glacier loses energy.

Question 10

How long do erratics last?

Answer 10

Depending on the size, they can last a long time as they are too big to be displaced by weathering alone

Question 11

What are moraines?

Answer 11

Deposits of eroded material transported with the glacier.

Question 12

What is a lateral moraine?

Answer 12

Material deposited on the sides of a glacier.

Question 13

What is a medial moraine?

Answer 13

Formed when two lateral moraines meet in the middle.

Question 14

What is ground moraine?

Answer 14

Material carried under the glacier and abraded.

Question 15

What is unique about ground moraine?

Answer 15

It is the only sorted moraine.

Question 16

What is recessional moraine?

Answer 16

Forms when a retreating glacier stays stationary.

Question 17

What does recessional moraine show?

Answer 17

Smaller, seasonal retreats.

Question 18

What is terminal moraine?

Answer 18

Material deposited at the snout of a glacier.

Question 19

How long do moraines last?

Answer 19

A medium amount of time.

Question 20

How do drumlins form?

Answer 20

Deposition from underneath glacier builds up behind an obstacle and is dragged over it.

Question 21

What shape are drumlins?

Answer 21

Tear drop shape.

Question 22

What are the sides of drumlins called?

Answer 22

Blunt stoss side and tapered lee side.

Question 23

How large can drumlins be?

Answer 23

Around 1500m long and 100m high.

Question 24

Where are drumlins found?

Answer 24

In groups called swarms.

Question 25

How long do drumlins last?

Answer 25

A long time.