A long, winding ridge of stratified sand and gravel is known as: 

Key Points

• A long, winding ridge of stratified sand and gravel is known as an esker.
• Eskers are formed by the deposition of sediments from meltwater rivers flowing within and beneath glaciers.
• They are typically sinuous and can extend for several kilometers.
• Eskers are important geological features that help scientists understand past glacial processes and environments.

Additional Information

• Moraines are accumulations of dirt and rocks that have fallen onto the glacier surface or have been pushed along by the glacier as it moves.
• Erratics are large boulders that have been transported and deposited by glacial ice, often found far from their source region.
• Aquifers are underground layers of water-bearing rock or materials through which groundwater can move.
• Understanding these geological terms is crucial for studies in glaciology, hydrology, and environmental science.