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• Select Abyssal Plain

  1

  Abyssal Plain

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 1. 6^th ed.)

  2021428 words Topic overview 1480LAbyssal 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....
• Select Earth's Interior

  2

  Earth's Interior

  Author:Mary D. AlbaneseFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20212,038 words Topic overview 1330LThe 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...
• Select Continent

  3

  Continent

  Author:Clay HarrisFrom:The Gale Encyclopedia of Science (Vol. 2. 6^th ed.)

  20211,992 words Topic overview 1260LA 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...