If Earths mantle is composed of rock, how can we say that the crust floats on the

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If Earth’s mantle is composed of rock, how can we say that the crust floats on the mantle?

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Related Book For  answer-question

Conceptual Physical Science

ISBN: 978-0134060491

6th edition

Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt

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