Why is the Earth slightly flattened at the poles (north and south)?

Question

The Earth is claimed to be a Sphere but in reality it is flatten at the poles. Why is this?

Answer 1

i watched this documentry and every 2 thousand years the earth goes around a different rotation pattern around the sun and on one of the rotation pattern it rotates closer around the sun then normal and on the other rotation it gets very colder  but its on the rotation where its closer to the sun meaning that temputures are hotter and global warming is a freat combination to get rid of the northen and sourthen poles

Answer 2

Because the Earth rotates (if you stand on the equator, you are moving roughly 1000mph), there is a bit of a bulge, plus the moon and sun both are pulling in the plane of the Earth's rotation.  The combined effect is to squash the poles and swell the equatorial regions.

Answer 3

10. Is Earth a sphere?

Because the planet rotates and is more flexible than you might imagine, it bulges at the midsection, creating a sort of pumpkin shape. The bulge was lessening for centuries but now, suddenly, it is growing, a recent study showed. Accelerated melting of Earth's glaciers is taking the blame for the gain in equatorial girth.

Answer 4

Because the earth rotathes on a line going from pole to pole called the axis.It spins alot more steady than you would think and the poles are the magnetic part of the planet

Answer 5

A hundred proofs the Earth is not a Globe

1. The aeronaut can see for himself that Earth is a Plane. The appearance presented to him, even at the highest elevation he has ever attained, is that of a concave surface - this being exactly what is to be expected of a surface that is truly level, since it is the nature of level surfaces to appear to rise to a level with the eye of the observer. This is ocular demonstration and proof that Earth is not a globe.

2. Whenever experiments have been tried on the surface of standing water, this surface has always been found to be level. If the Earth were a globe, the surface of all standing water would be convex. This is an experimental proof that Earth is not a globe.

3. Surveyors' operations in the construction of railroads, tunnels, or canals are conducted without the slightest "allowance" being made for "curvature," although it is taught that this so-called allowance is absolutely necessary! This is a cutting proof that Earth is not a globe.

4. There are rivers that flow for hundreds of miles towards the level of the sea without falling more than a few feet - notably, the Nile, which, in a thousand miles, falls but a foot. A level expanse of this extent is quite incompatible with the idea of the Earth's "convexity." It is, therefore, a reasonable proof that Earth is not a globe.

5. The lights which are exhibited in lighthouses are seen by navigators at distances at which, according to the scale of the supposed "curvature" given by astronomers, they ought to be many hundreds of feet, in some cases, down below the line of sight! For instance: the light at Cape Hatteras is seen at such a distance (40 miles) that, according. to theory, it ought to be nine-hundred feet higher above the level of the sea than it absolutely is, in order to be visible! This is a conclusive proof that there is no "curvature," on the surface of the sea - "the level of the sea,"- ridiculous though it is to be under the necessity of proving it at all: but it is, nevertheless, a conclusive proof that the Earth is not a globe.

6. If we stand on the sands of the sea-shore and watch a ship approach us, we shall find that she will apparently "rise" - to the extent, of her own height, nothing more. If we stand upon an eminence, the same law operates still; and it is but the law of perspective, which causes objects, as they approach us, to appear to increase in size until we see them, close to us, the size they are in fact. That there is no other "rise" than the one spoken of is plain from the fact that, no matter how high we ascend above the level of the sea, the horizon rises on and still on as we rise, so that it is always on a level with the eye, though it be two-hundred miles away, as seen by Mr. J. Glaisher, of England, from Mr. Coxwell's balloon. So that a ship five miles away may be imagined to be "coming up" the imaginary downward curve of the Earth's surface, but if we merely ascend a hill such as Federal Hill, Baltimore, we may see twenty-!five miles away, on a level with the eye - that is, twenty miles level distance beyond the ship that we vainly imagined to be " rounding the curve," and "coming up!" This is a plain proof that the Earth is not a globe.

7. If we take a trip down the Chesapeake Bay, in the day-time, we may see for ourselves the utter fallacy of the idea that when a vessel appears "hull down," as it is called, it is because the hull is "behind the water:" for, vessels, have been seen, and may often be seen - again, presenting the appearance spoken of, and away - far away - beyond those vessels, and, at the same moment, the level shore line, with its accompanying complement of tall trees towering up, in perspective, over the heads of the "hull-down" ships! Since, then, the idea will not stand its ground when the facts rise up against it, and it is a piece of the popular theory, the theory is a contemptible piece of business, and we may easily wring from it a proof that Earth is not a globe.

8. If the Earth were a globe, a small model globe would be the very best - because the truest - thing for the. navigator to take to sea with him. But such a thing as that is not known: with such a toy as a guide, the mariner would wreck his ship, of a certainty!, This is a proof that Earth is not a globe.

9. As mariners take to sea with them charts constructed as though the sea were a level surface, however these charts may err as to the true form of this level surface taken as a whole, it is clear, as they find them answer their purpose tolerably well - and only tolerably for many ships are wrecked owing to the error of which we speak - that the surface of the sea is as it is taken to be, whether the captain of the ship "supposes" the Earth to be a globe or anything else. Thus, then, we draw, from the common system of "plane sailing," a practical proof that Earth is not a globe.

10.- That the mariners' compass points north and south at the same time is a fact as indisputable as that two and two makes four; but that this would be impossible if the thing, were placed on a globe with "north" and "south' at the centre of opposite hemispheres is a fact that does not figure in the school-books, though very easily seen: and it requires no lengthy train of reasoning to bring out of it a pointed proof that the Earth is not a globe.

Answer 6

Earth is not a perfect sphere

Answer 7

The description 'flattened at the poles' is mentally derived by visualising the equatorial bulge and assuming that the flattened poles MUST feature as a consequence of this phenomenon. This, in reality is not the case. What is true is that due to the earth's rotation on its axis, along the line of the equator, a slight 'bulge' does exist along this area and accounts for a 43 km larger diameter across the equator compared with pole to pole. Earth is NOT claimed to be a sphere in the wider scientific and 'lay' community. The correct and most applicable description is an 'irregular oblate spheroid'. An oblate spheroid is a sphere-like object that has a pole diameter shorter than its equatorial diameter that may (depending on the difference between the 2) appear disc like in shape. (In the case of the earth the difference is so small that anyone would agree that to call the poles 'flattened' is wildly inaccurate). The descriptive, 'irregular' is included because notable variations in the diametrical measurements are observed.

Answer 8

suns gravity pulling at the equator

Answer 9

Dont listen to that lot they,ve been at the

radioactive singing ginger again.

Everyone knows this happend when

God dropped the earth on his way over here

from a good night out in his home town.

hence the reason nobodys seen him since.

Answer 10

centrifrugal force. The same thing that keeps water in a bucket when you swing it over your head. Because the earth is spinning on its axis the outer edges are thrown outwards as we spin - or they were when it was molten/semi setting dunno if its still being stretched.

Answer 11

Earth is an oblate spheroid, when it was molten the spin made the equator bulge.