Eskers
An esker is a long, winding ridge of stratified sand and gravel, which is deposited by a meltwater stream flowing through a tunnel beneath a glacier or ice sheet. It is a type of landform that is created by the deposition of glacial sediments. Eskers are typically found in areas that were once covered by glaciers and are often associated with other glacial landforms such as moraines and kames.
Formation of Eskers
Eskers are formed during the melting of glaciers. As the glacier retreats, meltwater streams flow through tunnels beneath the ice. These streams carry sediments such as sand and gravel, which are deposited in the tunnel. Over time, as the glacier continues to melt and retreat, the sediment is left behind, forming a long, winding ridge known as an esker.
Characteristics of Eskers
- Long and winding ridge
- Composed of stratified sand and gravel
- Formed by meltwater streams flowing beneath a glacier
- Often found in areas that were once covered by glaciers
- Associated with other glacial landforms such as moraines and kames
Study Guide
Here are some key points to remember about eskers:
- What is an esker and how is it formed?
- Describe the characteristics of eskers.
- Where are eskers typically found?
- What other glacial landforms are associated with eskers?
- Explain the role of meltwater streams in the formation of eskers.
Be sure to study the formation process and characteristics of eskers, as well as their relationship to glacial activity.
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