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Chapter 23: Problem 13

Distinguish among terminal moraines, lateral moraines, and medial moraines.

Short Answer

Expert verified
Terminal moraines are at the glacier's end, lateral moraines form along its sides, and medial moraines occur in the center when glaciers meet.

Step by step solution

01

Understanding Moraines

Moraines are accumulations of dirt and rocks that have been transported and deposited by a glacier. They are important indicators of past glacial activity and vary in form depending on their location relative to the glacier.
02

Define Terminal Moraines

Terminal moraines are identified as ridges of debris formed at the edge of a glacier's farthest advancement. They mark the maximum limit of a glacier's reach and form as the glacier deposits sediments in front of its snout (end) as it retreats.
03

Define Lateral Moraines

Lateral moraines are formed along the sides of a glacier. As a glacier moves, it scrapes off and accumulates rock and debris from the valley walls, which is then deposited alongside its edges when the ice melts.
04

Define Medial Moraines

Medial moraines occur when two glaciers with lateral moraines merge. The debris accumulates in the center as the glaciers join and form lines of rocks and sediment running down the middle of the merged glacier.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Terminal Moraines
Terminal moraines are fascinating geological features that provide critical evidence about the past behavior of glaciers. These landforms are essentially deposits of rocks and soil that have been left behind at the furthest point of a glacier's advance. When a glacier pushes forward, it acts like a giant bulldozer, scooping up earth materials in its path. These materials range from fine silt to large boulders. As the glacier recedes, it leaves behind a pile or ridge of this debris.

Key characteristics of terminal moraines include:
  • They are located at the glacier's terminus, marking its maximum reach.
  • The height and size of a terminal moraine can vary significantly depending on the glacier's size and the amount of debris it carries.
  • They often form semi-circular or arc-shaped ridges.
These moraines are not only important for understanding glacial history but also for studying environmental changes over time.
Lateral Moraines
When it comes to lateral moraines, imagining the glacier towering between two valley walls can help visualize their formation. As a glacier moves slowly down a valley, it continuously tears away chunks of rock from the valley sides. This debris is scraped off and transported by the moving ice.
  • As the glacier melts, these materials are deposited and create ridges along the glacier's edge.
  • Lateral moraines are parallel to the direction of the glacier's flow.
  • They can vary in size but are often narrower and less raised than terminal moraines.
The preserved lateral moraines tell us a great deal about the volume and speed of the glacier that created them. They also provide insights into the topography of the landscape and climatic conditions during the time of the glacier.
Medial Moraines
Medial moraines are fascinating because they tell a story of union, where two glaciers join forces. As individual glaciers flow down the mountain, they each carry debris along their sides, known as lateral moraines. When two such glaciers merge, these lateral moraines converge and form a conspicuous line of debris down the center of the new, larger glacier.
  • They appear as dark strips running down the middle of the glacier.
  • The formation of a medial moraine is a clear indicator of the merging of glaciers.
  • The size and prominence of medial moraines depend on the amount and type of debris transported by the original glaciers.
Studying medial moraines can reveal invaluable information about the interaction and dynamics of glaciers as well as changes in the environment and landscape over time.

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