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🧊 How do glaciers carve valleys?

Debris-laden ice abrades and plucks bedrock, leaving U-valleys, moraines, and cirques.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Ice that movesDefine glaciers as flowing ice that carries debris under gravity.Compacted snow becomes ice that creeps and slides. Debris rides the sole. Motion plus grit prepares the landscape for carving.
Scraping and plucking the bedrockDistinguish abrasion from plucking and note meltwater’s role.Abrasion sands and striates; plucking tears blocks free. Rock flour milky rivers show grinding in action. Water under ice is a frequent partner.
U-shaped valleys and the aftermathRead U-valleys, moraines, cirques, and related forms as glacial legacy.Ice remodels valleys toward U profiles. Moraines and lakes mark retreat. Cirques and horns sculpt high peaks after the ice is gone.

Questions this course answers

Why is glacial ice effective at carving hard rock?

Debris-charged ice abrades and helps pluck bedrock; clean ice alone is a weaker scraper than ice plus grit.

Order how abrasion leaves field evidence

Grit in ice scours bedrock, leaving polish and aligned scratches that record flow direction.

In your own words, why do many glaciated mountain valleys look U-shaped rather than V-shaped?

Ice thick enough to fill a valley scours walls and floor over long times, remodeling a stream’s V toward a glacial U trough.

Grounded in trusted sources

USGS — glaciers and glacial landforms education pages
NOAA / National Snow and Ice Data Center glacier primers
British Geological Survey glacial processes summaries
University geomorphology texts on abrasion, plucking, and U-shaped valleys

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