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continental shield |
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continental shieldAny of the large stable areas of low relief (little variation in elevations) in the Earth's crust that are composed of Precambrian crystalline rocks. These rocks are always more than 570 million years old, and some are as old as 2–3 billion years. Continental shields occur on each of the continents. continental shield [¦känt·ən¦ent·əl ′shēld] (engineering) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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