Moraine Types and Characteristics

This video tutorial covers the topic of moraines and till in the context of AS level physical geography. It explains the difference between till and moraine, and describes various types of moraines including lateral, ground, medial, terminal, and recessional moraines. The video also includes diagrams to illustrate how glaciers move and deposit sediment, forming different types of moraines. The tutorial concludes with a review and questions to test understanding.

What is the primary difference between lodgment till and ablation till?

• Lodgment till is formed by erosion, ablation till by deposition.

• Lodgment till is found at the glacier's base, ablation till at the sides.

• Lodgment till is deposited by a moving glacier, ablation till by a melting glacier.

• Lodgment till is sorted by size, ablation till is not.

What is the main characteristic of glacial till?

• It is unsorted sediment.

• It is only formed by melting glaciers.

• It is sorted by size.

• It is only found at the glacier's base.

Where is lateral moraine typically located?

• At the glacier's furthest point

• On the sides of the glacier

• In the middle of the glacier

• At the base of the glacier

How does ground moraine differ from lateral moraine?

• Ground moraine is found in the middle, lateral moraine at the base.

• Ground moraine forms from melting glaciers, lateral moraine from moving glaciers.

• Ground moraine is located at the base, lateral moraine at the sides.

• Ground moraine is sorted by size, lateral moraine is not.

What occurs when two glaciers merge to form a medial moraine?

• The glaciers stop moving and deposit all sediment.

• The lateral moraines of each glacier join in the middle.

• The glaciers erode the valley sides, forming a new moraine.

• The glaciers melt completely, leaving behind sediment.

What indicates the furthest point a glacier has reached?

• Lateral moraine

• Ground moraine

• Terminal moraine

• Medial moraine

What happens to a glacier when it forms a terminal moraine?

• It gains energy and moves forward.

• It loses energy and deposits sediment.

• It merges with another glacier.

• It erodes the valley sides.

How is recessional moraine different from terminal moraine?

• Recessional moraine is found at the glacier's sides.

• Recessional moraine is sorted by size.

• Recessional moraine forms as the glacier advances.

• Recessional moraine is deposited during glacier retreat.

What process leads to the formation of recessional moraine?

• Glacier retreat

• Glacier advancement

• Glacier merging

• Glacier melting

Which type of moraine is formed by the process of ablation?

• Ground moraine

• Recessional moraine

• Lateral moraine

• Medial moraine