○○○carry⪢⪢
Over many years, the Colorado River has carried away particles of dirt and rock carving its path deeper and deeper into the ground.
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○○○erode⪢⪢
The way the ocean _____s the shore depends how the water moves and what kind of rock the shore is made of.
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○○○slab⪢⪢
Glaciers are sometimes called 'rivers of ice' because they are huge _____s of ice and snow that move very slowly across the landscape.
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