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  2. Figure of the Earth - Wikipedia

    en.wikipedia.org/wiki/Figure_of_the_Earth

    The curvature of the Earth is evident in the horizon across the image, and the bases of the buildings on the far shore are below that horizon and hidden by the sea. The simplest model for the shape of the entire Earth is a sphere. The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius ...

  3. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth's western hemisphere showing topography relative to Earth's center instead of to mean sea level, as in common topographic maps. Earth has a rounded shape, through hydrostatic equilibrium, [85] with an average diameter of 12,742 kilometres (7,918 mi), making it the fifth largest planetary sized and largest terrestrial object of the Solar ...

  4. Spherical Earth - Wikipedia

    en.wikipedia.org/wiki/Spherical_Earth

    as the shape of the geoid, the mean sea level of the world ocean; or; as the shape of Earth's land surface as it rises above and falls below the sea. As the science of geodesy measured Earth more accurately, the shape of the geoid was first found not to be a perfect sphere but to approximate an oblate spheroid, a specific type of ellipsoid.

  5. 37 Earth Day Activities for Kids - AOL

    www.aol.com/37-earth-day-activities-kids...

    Monday, April 22nd marks Earth Day 2024, and while we aren’t limiting our pledge to live a little greener to a single day, it’s a great opportunity to teach our kids about living sustainably ...

  6. 20 Earth Day facts that aren't common knowledge - AOL

    www.aol.com/news/10-earth-day-facts-might...

    Brush up on your Earth Day knowledge with these interesting Earth Day facts and trivia about how it began and why we celebrate Mother Earth on April 22.

  7. Test your global knowledge with these Earth Day trivia questions

    www.aol.com/news/earth-day-quiz-whats-one...

    Whether you're an Earth Day expert or hoping to learn more about our beautiful blue planet, these trivia questions will help you brush up on your planetary proficiency. Earth Day Quiz Questions

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

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

    The shadow of Earth on the Moon during a lunar eclipse is always a dark circle that moves from one side of the Moon to the other (partially grazing it during a partial eclipse). The only shape that casts a round shadow no matter which direction it is pointed is a sphere, and the ancient Greeks deduced that this must mean Earth is spherical. [8]

  9. Internal structure of Earth - Wikipedia

    en.wikipedia.org/wiki/Internal_structure_of_Earth

    Earth's crust and mantle, Mohorovičić discontinuity between bottom of crust and solid uppermost mantle. Earth's mantle extends to a depth of 2,890 km (1,800 mi), making it the planet's thickest layer. [20] [This is 45% of the 6,371 km (3,959 mi) radius, and 83.7% of the volume - 0.6% of the volume is the crust].

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