秘鲁的的喀喀湖的芦苇浮岛，古老科学
Lake Titicaca is a big lake in Peru and Bolivia. People called the Uros live there on floating islands. These islands are made only of reeds, a tall plant that grows in water.
The reeds are very light but strong. They have many air pockets inside. Air makes them float on water, just like a life jacket helps you swim.
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