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  2. The Sixth Extinction: An Unnatural History - Wikipedia

    en.wikipedia.org/wiki/The_Sixth_Extinction:_An...

    576.8/4. LC Class. QE721.2.E97 K65 2014. The Sixth Extinction: An Unnatural History is a 2014 non-fiction book written by Elizabeth Kolbert and published by Henry Holt and Company. The book argues that the Earth is in the midst of a modern, man-made, sixth extinction. In the book, Kolbert chronicles previous mass extinction events, and compares ...

  3. Asthenosphere - Wikipedia

    en.wikipedia.org/wiki/Asthenosphere

    The asthenosphere (from Ancient Greek ἀσθενός (asthenós) 'without strength') is the mechanically weak [1] and ductile region of the upper mantle of Earth. It lies below the lithosphere, at a depth between ~80 and 200 km (50 and 120 mi) below the surface, and extends as deep as 700 km (430 mi). However, the lower boundary of the ...

  4. Category:Holt, Rinehart and Winston books - Wikipedia

    en.wikipedia.org/wiki/Category:Holt,_Rinehart...

    The War Against the Jews. Warday. The Warriors (Yurick novel) A White House Diary. A World Out of Time.

  5. Earth system science - Wikipedia

    en.wikipedia.org/wiki/Earth_system_science

    Earth system science. An ecological analysis of CO. 2 in an ecosystem. As systems biology, systems ecology seeks a holistic view of the interactions and transactions within and between biological and ecological systems. Earth system science (ESS) is the application of systems science to the Earth. [1][2][3][4] In particular, it considers ...

  6. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    Earth science. The rocky side of a mountain creek in Costa Rica. Earth science or geoscience includes all fields of natural science related to the planet Earth. [1] This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres: the biosphere, hydrosphere ...

  7. Earth's orbit - Wikipedia

    en.wikipedia.org/wiki/Earth's_orbit

    Earth orbit (yellow) compared to a circle (gray) Earth orbits the Sun at an average distance of 149.60 million km (92.96 million mi), or 8.317 light-minutes, [1] in a counterclockwise direction as viewed from above the Northern Hemisphere. One complete orbit takes 365.256 days (1 sidereal year), during which time Earth has traveled 940 million ...