The Earth's crust is like a hard-boiled egg's shell - thin and tough. It takes up less than 1% of the planet's size. At a depth of 3,300 ft, ... ... <看更多>
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The Earth's crust is like a hard-boiled egg's shell - thin and tough. It takes up less than 1% of the planet's size. At a depth of 3,300 ft, ... ... <看更多>