Second Class science · D.2 · Earth materials
What causes erosion
Wind, water, and ice can wear away rocks over time. They carry small pieces or push against rock surfaces.
See worked examples
In science class, Nora asks: Why does the river make the mountain side smaller?
- Rocks fall off by themselves
- Water wears away rock (right)
- Ice melts and grows bigger
In science class, Ana asks: Why does the river make the mountain side smaller?
- Wind blows rocks into the water
- Water wears away rock (right)
- Ice melts and grows bigger
Priya notices sand dunes near a lake. What is most likely causing them?
- Plants are growing too tall
- Wind moves the sand (right)
- Ice sheets are melting fast
Tip: Wind, water, and ice can wear away rocks over time. They carry small pieces or push against rock surfaces.
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