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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. 25 Exciting Earth Day Activities for Kids - AOL

    www.aol.com/lifestyle/21-earth-day-activities...

    3. Ride before you drive. Wherever you need to go on Earth Day, from point A to point B, make it a priority to leave a little earlier and trade your tires for some wheels.

  4. History of Earth - Wikipedia

    en.wikipedia.org/wiki/History_of_Earth

    The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.

  5. The World Almanac - Wikipedia

    en.wikipedia.org/wiki/The_World_Almanac

    The World Almanac and Book of Facts, 1987, besides a tea kettle, TIPA, Dharamsala, India. In 1894, when it claimed more than a half-million "habitual users," The World Almanac changed its name to The World Almanac and Encyclopedia. This was the title it kept until 1923, when it became The World Almanac and Book of Facts, the name it bears today.

  6. Eastern Hemisphere - Wikipedia

    en.wikipedia.org/wiki/Eastern_Hemisphere

    The almost perfect circle (the earth is an oblate spheroid that is wider around the equator), drawn with a line, demarcating the Eastern and Western Hemispheres must be an arbitrarily decided and published convention, unlike the equator (an imaginary line encircling Earth, equidistant from its poles), which divides the Northern and Southern hemispheres.

  7. The World Factbook - Wikipedia

    en.wikipedia.org/wiki/The_World_Factbook

    The World Factbook was first available to the public in print in 1975. [10] Until 2008 the CIA printed the Factbook ; from then it has been printed by the Government Printing Office [ 11 ] following a CIA decision to "focus Factbook resources" on the online edition. [ 12 ]

  8. Mantle (geology) - Wikipedia

    en.wikipedia.org/wiki/Mantle_(geology)

    The Earth's mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 10 24 kg is 67% the mass of the Earth. [1] It has a thickness of 2,900 kilometres (1,800 mi) [1] making up about 84% of Earth's volume. It is predominantly solid, but in geological time it behaves as a viscous fluid

  9. World map - Wikipedia

    en.wikipedia.org/wiki/World_map

    A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.

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