如果把地球比作一个苹果，它的地壳、地幔和核心分别对应苹果的哪部分？请以三个英文句子的形式回答。
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If the Earth were compared to an apple, the Earth's crust would correspond to the apple's skin. The Earth's mantle would be akin to the apple's flesh. The Earth's core would correspond to the apple's seeds.
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