十万个为什么·科学阅读30篇（3）
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What Makes Sand Dunes Move Across Deserts?
是什么让沙丘在沙漠中移动？
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Wind pushes sand grains across flat desert ground.
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Grains bounce and roll like tiny skipping stones.
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Bigger dunes move slower than small ripples.
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Shape changes as wind direction shifts over time.
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Some dunes march several meters each year.
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Plants or rocks can stop dune movement.
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Dunes form patterns like waves or crescents.
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This shows how air shapes Earth’s surface slowly.