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• Select Geologic Time

  1

  Geologic Time

  Author:Clinton CrowleyFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20211,908 words Topic overview 1310LAlthough historical time covers centuries and archeological times covers millennia, geologic time describes the span of time—billions of years—revealed in the fossil and rock record. Geochronology is the science of...
• Select Earth's Geologic History

  2

  Earth's Geologic History

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20211,936 words Topic overview 1250LIn the modern era of Earth history, our planet, the third planet outward from the Sun, is home to millions of species. However, approximately 4.54 billion years earlier, Earth was just forming—devoid of, and very hostile...
• Select Historical Geology

  3

  Historical Geology

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 4. 6^th ed.)

  2021551 words Topic overview 1280LHistorical geology is the study of changes in Earth and its life forms over time. It includes sub-disciplines such as paleontology, paleoclimatology, and paleoseismology. In addition to providing a scientific framework...
• Select Geologic Map

  4

  Geologic Map

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  2021543 words Topic overview 1270LGeologic maps are graphical representations of rocks, sediments, and other geologic features observed or inferred to exist at or beneath Earth's surface. They can be based on observations of outcrops in the field,...
• Select Geology

  5

  Geology

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  2021826 words Topic overview 1280LGeology is the study of Earth. Modern geology includes studies in seismology (earthquake studies), volcanology, energy resources exploration and development, tectonics (structural and mountain building studies),...
• Select Hoatzin

  6

  Hoatzin

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 4. 6^th ed.)

  2021398 words Topic overview 1080LThe hoatzin (Opisthocomus hoazin) is one of the world's most peculiar bird species. It is the sole member of its family, Opisthocomidae. It is peculiar enough to have defied taxonomists' best efforts for years. This...
• Select Astroblemes

  7

  Astroblemes

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

  2021547 words Topic overview 1390LAstroblemes are the scars left on Earth's surface by the high velocity impacts of large objects from outer space. Such colliding bodies are usually meteorites, but some may have been comet heads or asteroids. Few of...
• Select Mass Extinction

  8

  Mass Extinction

  Author:David T. KingFrom:The Gale Encyclopedia of Science (Vol. 5. 6^th ed.)

  20211,437 words Topic overview 1410LExtinction, the death of all members of a species, is a natural process that has been occurring since the beginning of life on Earth. Nearly all species that have ever existed are now extinct—about 99.9% of them—and...
• Select Planetary Geology

  9

  Planetary Geology

  Author:David T. KingFrom:The Gale Encyclopedia of Science (Vol. 6. 6^th ed.)

  20211,227 words Topic overview 1450LPlanetary geology is a branch of geology devoted to the study of structure, composition, processes, and origin of major and minor planetary bodies traditionally inside and now, in the twenty-first century, outside the...
• Select North America

  10

  North America

  Author:Clinton CrowleyFrom:The Gale Encyclopedia of Science (Vol. 5. 6^th ed.)

  20214,756 words Geographic overview 1310LThe landmass occupied by the present-day countries of Canada, the United States, and the Republic of Mexico makes up North America. Greenland (Kalaallit Nunaat), an island landmass to the northeast of Canada, is also...