Earth Without Oceans: Why It Would No Longer Be a Sphere

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The discussion revolves around the implications of removing Earth's oceans and how it affects the planet's shape, specifically questioning whether it would still be considered a sphere. Participants explore the relative scale of Earth's features, including oceans and mountains, in relation to its overall size.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the depth of oceans compared to Earth's diameter and question the significance of these dimensions in defining the planet's shape. There are considerations of Earth's oblate spheroid nature and how that relates to the removal of water.

Discussion Status

The conversation is ongoing, with participants sharing observations about the relative sizes of Earth's features. Some provide analogies, such as comparing Earth to an apple, to illustrate their points. There is no explicit consensus, but various interpretations of Earth's shape and dimensions are being explored.

Contextual Notes

Participants note that Earth's oceans are relatively shallow compared to its overall size, which raises questions about the importance of these features in defining its shape. The discussion also touches on the concept of Earth's oblate spheroid form and how that might change without oceans.

monty37
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if we remove all of Earth's seas and oceans it would no longer be a sphere,since the water all over covers it ,it appears a sphere,right?
 
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monty37 said:
if we remove all of Earth's seas and oceans it would no longer be a sphere,since the water all over covers it ,it appears a sphere,right?

The oceans are a mere 2 miles deep on average. On a sphere 7800 miles in diameter, that's chump change. The highest mountains and deepest oceans are proportionately no thicker than the skin is on an apple.


Note though, that Earth is not a perfect sphere. It is an oblate spheroid, thicker around its equator than around its poles by about 60km, due to its rotation.
 
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well ,then even the world's deepest trench would appear too tiny on earth(without ocean) as a whole huge surface
 
monty37 said:
well ,then even the world's deepest trench would appear too tiny on earth(without ocean) as a whole huge surface
Yep. At 6 miles, it is a mere 1300th of the Earth's diameter. On an apple, that would be a dent less than a tenth of a millimeter.

Forget the apple, we're talkin' cueball.
 

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