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  2. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.

  3. Earth science - Wikipedia

    en.wikipedia.org/wiki/Earth_science

    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 / cryosphere , atmosphere , and geosphere (or lithosphere ).

  4. Biogeographic realm - Wikipedia

    en.wikipedia.org/wiki/Biogeographic_realm

    Biogeographic realms are characterized by the evolutionary history of the organisms they contain. They are distinct from biomes, also known as major habitat types, which are divisions of the Earth's surface based on life form, or the adaptation of animals, fungi, micro-organisms and plants to climatic, soil, and other conditions

  5. 50 Earth Day Trivia Questions and Answers to Inspire You to ...

    www.aol.com/lifestyle/50-earth-day-trivia...

    Answer: 192. Question: Earth Day's founding was partially inspired by protestors against what? ... Question: What 1968 book warned of the dangers of overpopulation on the planet?

  6. Natural environment - Wikipedia

    en.wikipedia.org/wiki/Natural_environment

    There are four major disciplines in earth sciences, namely geography, geology, geophysics and geodesy. These major disciplines use physics , chemistry , biology , chronology and mathematics to build a qualitative and quantitative understanding of the principal areas or spheres of Earth.

  7. Isaac Asimov's Guide to Earth and Space - Wikipedia

    en.wikipedia.org/wiki/Isaac_Asimov's_Guide_to...

    Guide to Earth and Space (ISBN 0-449-22059-1) is a non-fiction work by American writer Isaac Asimov and published by Random House in 1991. The book differs somewhat in structure from typical literature by presenting its information in the form of answers to a series of questions, presumably posed by the reader.

  8. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Outline of Earth sciences - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Earth_sciences

    Earth's ecosphere lies it self within the heliosphere (the Sun's astrosphere). [4] Listed roughly from outermost to innermost the named spheres of the Earth are: Magnetosphere – The region around an astronomical object in which charged particles are affected by its magnetic field; Atmosphere, the gases that surround the Earth (its air) By ...