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  2. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    Adherence to the geocentric model stemmed largely from several important observations. First of all, if the Earth did move, then one ought to be able to observe the shifting of the fixed stars due to stellar parallax. Thus if the Earth was moving, the shapes of the constellations should change considerably over the course of a year. As they did ...

  3. JumpStart Adventures 6th Grade: Mission Earthquest - Wikipedia

    en.wikipedia.org/wiki/JumpStart_Adventures_6th...

    Single-player. JumpStart Adventures 6th Grade: Mission Earthquest is a game created by Knowledge Adventure in the JumpStart series. In this game A.R.T., a computer with artificial intelligence, has gone haywire, and now wants to "redesign the chaotic system that is Earth ". Zack and Jess, twin brother and sister agents of Earthquest, stop him ...

  4. Five themes of geography - Wikipedia

    en.wikipedia.org/wiki/Five_themes_of_geography

    Five themes of geography. Location. Place. Human-Environment Interaction. Movement. Region. The five themes of geography are an educational tool for teaching geography. The five themes were published in 1984 [1] and widely adopted by teachers, textbook publishers, and curriculum designers in the United States. [2]

  5. Diatomaceous earth - Wikipedia

    en.wikipedia.org/wiki/Diatomaceous_earth

    Diatomite rock sample from Sisquoc Formation Scanning electron micrograph of diatomaceous earth. Diatomaceous earth (/ ËŒ d aɪ. É™ t É™ ˈ m eɪ ʃ É™ s / DY-É™-tÉ™-MAY-shÉ™s), diatomite (/ d aɪ ˈ æ t É™ m aɪ t / dy-AT-É™-myte), celite or kieselgur/kieselguhr is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder.

  6. Internal structure of Earth - Wikipedia

    en.wikipedia.org/wiki/Internal_structure_of_Earth

    Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon 's radius. [32][33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel.

  7. Empirical evidence for the spherical shape of Earth - Wikipedia

    en.wikipedia.org/wiki/Empirical_evidence_for_the...

    The roughly spherical shape of Earth can be empirically evidenced by many different types of observation, ranging from ground level, flight, or orbit. The spherical shape causes a number of effects and phenomena that combined disprove flat Earth beliefs. These include the visibility of distant objects on Earth's surface; lunar eclipses ...

  8. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.

  9. Figure of the Earth - Wikipedia

    en.wikipedia.org/wiki/Figure_of_the_Earth

    The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius" normally is a characteristic of perfect spheres, the Earth deviates from spherical by only a third of a percent, sufficiently close to treat it as a sphere in many contexts and justifying the term "the radius of the Earth".

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