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Why is the earth round?

Why is the earth round?
Thomas Pullen from Warwickshire (age 5-14)
Jimmy from Surrey (age 5-14)
Katie from Kent (age 5-14)
Freya Eakins from Swansea (age 5-14)

Why is the world round?
Ruis Walton from Lincolnshire (age 5-14)

Why is the earth shaped like a sphere?
Jakie from Stockton on Tees (aged 5-14)
Arthur Dixon from Hampshire (aged 5-14)

I wonder why the world is round
Emilia from West Midlands (aged 5-14)

Why is the world round? Why couldn’t it be a different shape?
Catriona Staunton from Kent (aged 5-14)


2 Responses

  1. Strictly, it isn’t a perfect sphere – it’s what’s called an oblate spheroid – a sphere that’s been squashed a bit. Its round because of how it formed – from a spinning area of matter drawn together by gravity

  2. This is a very good question !

    The Earth and the sufficiently heavy bodies in the solar system will adopt a round shape because of …gravity.
    Gravity is a force directly proportional to the mass of the object and is equal in all direction. As the planet forms, its matter is pulled towards the centre of the planet in equal measure, leading over time to a spherical object.

    …but building on this idea, the Earth is also rotating, and this create a centrifugal force (pulling away from the rotation axis) that create a slight bulge at the equator while flattening the poles.

    A good illustration can be found here: http://www.hockeycosom.net/planet_earth_complete/composition_planet_earth.html

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