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What Makes Sand Dunes Move Across Deserts?

What Makes Sand Dunes Move Across Deserts?

是什么让沙丘在沙漠中移动?

  1. Wind pushes sand grains across flat desert ground.
  2. Grains bounce and roll like tiny skipping stones.
  3. Bigger dunes move slower than small ripples.
  4. Shape changes as wind direction shifts over time.
  5. Some dunes march several meters each year.
  6. Plants or rocks can stop dune movement.
  7. Dunes form patterns like waves or crescents.
  8. This shows how air shapes Earth’s surface slowly.
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