Why our world is round?

Answer 1

It has to do with rotational inertia. Consider how when you spin around your arms want to fling outward -- same thing, except it's the matter of the earth that is being flung outward and creating the bulge in the middle.

Answer 2

This answer was provided to a previous similar question. It sums things up nicely:

The more massive an object is, the more it will be affected by its own gravitational attraction. Every bit of matter in a body is attracted to every other bit of matter. The bigger the body is, the greater the attraction on each bit. The natural result of this attraction is a spherical shape, since each molecule is attracted to the center of mass, and a sphere minimizes the distance of each molecule from the center.

The only important factor here is mass. The more massive an object is, the more quickly it will pull itself into a spherical shape. So stars will always be spheres, terrestrial planets (like Earth) will have some surface features, smaller moons will have more pronounced surface features, and even smaller objects will form less-spherical shapes (Mars' moons, for instance, are extremely small and are not spherical).

Me again. Pretty cool answer, huh? If you understand it, you will also understand that our earth, while not perfectly round, will never have unusual features such as 50 mile high mountains. Gravity would cause such anomalies to crush themselves.

Answer 3

WHAT??!! You mean it isn't flat? Sheesh. Boy, do I feel really dumb.

Actually, I heard it isn't exactly round but rather slightly eliptical in shape, which makes sense when you consider the north and south poles and where the equator lies in relation to the magnetic fields. But ... then I've been told a lot of stuff that isn't true. Like ... the earth being flat, for example. And that there is a qualitative difference between aluminum and aluminium ... 2 completely separate chemicals (told this by a chemistry teacher, no less ... jerk). Oh ... and that the Pullitzer Prize is supposed to read Poulet Surprise, meaning a chicken dinner.

Sincerely,
The Queen of Gullibility

Answer 4

everyday I come in here to contribute data and see this question my multiple people. Why waste 5pts. oh well I will tell you.

The earth is globaly semetrical meaning even all around for many reasons. for one semetrical force of gravity holding it together. also it can hold pressure.. ever wonder why an egg is round? that is because it can withstand more pressure. if it was boxed or flat, it would break twice as easy. gas trucks that deliver gasoline are also round for the same reason. a mask that you would wear to go DEEP sea diving would have to be round because the farthure in the ocean you go the greater the pressure till it could actually crush you if gone deep enough. the round mask on your head protects you also the mask itself will not collaps if deep enough because it is spherical. when diving in a pool ever wonder why your ears pop or even hurt. thats pressure.

Answer 5

It's the gravity, of course.
Round ... but not always completely round. Earth bulges a little at the equator, because rotation flings matter outwards, weakening gravity there by a fraction of 1%.

Answer 6

It is round, but not perfectly round, The distance around the
equater is larger than the distance around north and south,
due to the earths rotation.
Round and round she goes, When she will explode, nobody
Knows, with the "nuke" race.

Answer 7

graivty pulls equally in all directions. Over a certain mass, all bodies in space are spherical. This is the lowest energy state.

if you go to google and type this exact question, you will get sites written by scientists with very detailed answers

http://www.gsfc.nasa.gov/scienceques2002/20021101.htm

Answer 8

cuz it had to roam around the sun to have the life started but sun put a condition that she has to look like him! ;)
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cuz a sphere or any shape closer to the sphere has its energy balanced, cuz the centre of the earth generates the gravity, if it was a cube then all the outer points of the earth wont be at equal distance, holding equal forces......
lets say it was a cube, a much bigger cube, but its gravitational field could only hold a particular, static distanced material, and in that case, the rest of it would fly away....!
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or take it this way, if some material is to be held by only a single source of energy, it has to be a circle in 2d and a sphere in 3d!

Answer 9

ALL planets r round

Answer 10

gravity... its not perfectly round, its a lil wider at the equator