| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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| ice ages |
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| Periods in the history of the Earth when large glaciers covered much of the surface of the continents. | 1 |
| ‡ The last ice age ended less than twenty thousand years ago. | 2 |
| ‡ Scientists believe that there will be more ice ages in the future, caused by tiny changes in the Earth’s orbit and rotation. | 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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