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- 1From:The Gale Encyclopedia of Science (Vol. 1. 6th ed.)Abyssal plains are sediment-covered portions of the deep ocean floor. With surface slopes of less than one foot of elevation difference for each thousand feet of horizontal distance, they are the flattest areas on Earth....
- 2From:The Gale Encyclopedia of Science (Vol. 3. 6th ed.)The radius of Earth—that is, the distance from its center to its surface—is about 3,950 mi (6,370 km). Geologists understand the structure and composition of the surface by direct observation and by analysis of rock...
- 3From:The Gale Encyclopedia of Science (Vol. 2. 6th ed.)A continent is a large land mass and its surrounding shallow continental shelf. Both are composed primarily of granite, which is lighter than the liquid mantle of the Earth and therefore floats upon it like cork on...
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