why ios the earth round?
551432
It's just an assumption...\n\ncoz it looks like a sphere... like how the moon looks round...\n\nBut can u be sure!!!
739091
because the earth rotates on an axis
1069004
For the most part, the atmosphere moves along with the surface of the earth. On the other hand, winds going in any direction tend to grind down mountain peaks.\n\nHowever, if the Earth were not fairly close to round, then the molten lava inside the earth would rupture the crust and deform the earth into a round shape. The main reason the Earth is round is gravity, not wind.
280298
you are stupid. would a computer say that. yes, the earth is round.
114224
Only bodies with a large gravitational mass are round. There is enough gravity to pack it more tightly and this combined with roation of the object forms a round shape. Smaller objects like asteroids, comets and small moons often have irregular shape because there was not enough gravitational mass to compress the object into a round shape
993320
Planets are not "round" but in fact "spherical".  Planets are spherical because gravity acts upon each part of the planet, pulling it closer to the center.  A sphere is the most efficient shape to contain the greatest volume with the smallest dimensions.  In the case of a sphere, the radius is a smaller distance from the center of the planet than any other shape could manage, thus, matter naturally forms this shape in the absence of other factors.\n\nIt is important to note that the planets were not always as cool and ridged as they are now.  When the planets were born, they were made of molten elements, and did not solidify until their shape had already taken.  In some other cases, where planets were formed through the collision of multiple bodies, the heat generated by the impact liquified sufficient amounts of the bodies for a spherical shape to form.
245562
I think at space is round like the earth and that there really  not straight flat
816024
The earth's shape is not define.But , Aryabhatta tells that the earth is round.
576059
The earth isn't round. It's a squashed sphere, due to it's rotation.\n\nI wish grass fell from the sky. I have to go find a guy who knows a guy to get my grass.
1069514
By Newton's law of graitation any mass is attracted by another mass. Since the planets are matter like our Earth, the pull of gravity in all directrion make the planet spherical.\n\nThe spin of the planets about their axes actually make them close to  ellipsoid of revolution and not spherical. Our earth is also  close to ellipsoid of revolution.
469675
Planets came from clouds of spinning gases that later solidified.   So they are pretty round, but not exactly spherical.  The earth is around 8,000 miles in diameter.  Black holes are proven.  They were proven using gravity experiments on nearby bodies and light experiments from stars "behind" them when viewed from earth.
1102975
Because gravity pulls equally in all directions.\nAs soon as the materials that the earth is made of began to gather together under self-gravity, the center pulled equally in all directions.  As heat from friction and radioactivity made much of the early earth molten, gravity pulled it into the most efficient shape -- a sphere.  Because of the earth's rotation and centrifugal force, it's not quite a perfect sphere -- it bulges a bit at the equator and is slightly flattened at the poles -- but it's simply gravity doing what it does naturally.  It's why all large bodies are in the shape of a sphere.
124798
This has to do with the way the earth was formed. Dust particles gathering together and spinning at the same time. Spinning causes things to take spherical shape due to centrifugal force.
224099
It's not that strange, why would you expect the Earth's orbit to be a perfect circle.\n\nEverything revolve in a elliptical orbit, because they can't all start moving in perfect circles, that's impossible, so when Earth got closer to the Sun, it basically falls and accelerates because of gravity, but because it's now faster, it can bypass the Sun so it won't crash into it.
285187
The are round, in short, because it takes the least enegry to do it.\n\nGravity pulls the matter that will make up the planets/sun/... together.  All the forces are pointed towards to the objects center of mass, everything is being pulled inward toward the center.  With everything trying to get as close as possible to the same center of mass, the object develops a round/sphereical shape.  This shape minimizes the amount of potential energy the matter has above the center of mass.\n\nThe reason why some objects (like the Earth for example) as not totally sphereical is because they are roating around an axis.  Since the Earth is rotating on its axis (causing our days and nights), there is a bulge around the equator as the matter located there is rotating faster [tangential speed] than the matter located at the poles.  This faster tangential speed requires more centripetal force [not to be confused with the fictional "centrifugal" force] or order to keep it rotating.  In order to lessen the required force, the matter bulges out a little bid, increasing its radius away from the axis.\nCentripetal force = m(v^2/r),\nyou can see that a larger radius (r) away from the center means a smaller centripetal force is needed.
91665
Its more of an elispse, not perfectly round due to the gravitational pull of the oceans by the moon and due to mountains.
185547
not without knowing it is right to a reasonable degree. For instance if this were 1400 and you asked if the world was flat i would say of course but we now know that it is round. Science is constantly changing thier answers to a lot of questions due to the fact that new research is proving them incorrect.