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.风将沙粒吹过平坦的沙漠地面。
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Grains bounce and roll like tiny skipping stones.沙粒像微小的弹跳石子一样弹跳和滚动。
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Bigger dunes move slower than small ripples.大型沙丘比小型波纹移动得更慢。
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Shape changes as wind direction shifts over time.随着风向随时间变化,沙丘形状也随之改变。
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Some dunes march several meters each year.有些沙丘每年可移动数米。
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Plants or rocks can stop dune movement.植物或岩石能阻止沙丘移动。
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Dunes form patterns like waves or crescents.沙丘形成波浪状或新月形等图案。
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This shows how air shapes Earth’s surface slowly.这表明空气缓慢地塑造着地球表面。