| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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| crust |
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| In geology, the outermost layer of the Earth. It overlies the mantle. | 1 |
| ‡ The crust includes the continents and the ocean bottom and is generally estimated to be about five to twenty-five miles thick. | 2 |
| ‡ The crust is made from relatively lightweight rocks that floated to the surface when the Earth was molten early in its history. | 3 |
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| | | The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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