Mon Prof Augmenté
Ice Splits the Rock
Age 12 · Geography
Water seeps into a crack in the rock face and freezes overnight. As it turns to ice it takes up more room and pushes the crack wider until a block breaks away.
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Age 12: open this week
Browse Age 12
In the picture
- The ice wedge filling the crack
- The crack walls forced apart
- A loosened block tipping outward
- The slope of sharp broken fragments below
Examples
- A road surface cracking after a frosty winter night
- A stone wall crumbling after many winters
Key takeaways
- Water expands by about 9% when it freezes.
- Repeated freezing and thawing breaks rock into sharp, angular pieces.
Quiz: Ice Splits the Rock (Age 12)
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About what percentage more space does water take up when it freezes?
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What happens to water in a rock crack when it freezes?
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After repeated freezing and thawing, what does the rock break into?
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