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Like many of its inhabitants, the Earth is getting thicker around the middle -- that's what a new study out this week says. The increased bulge is due to the melting of the Greenland and Antarctic ice sheets.
Originally posted by A por uvas
I love this video
also if earth is expanding
what's in the middleedit on 29-7-2011 by A por uvas because: (no reason given)
The Earth's Crust, Lithosphere and Asthenosphere
Crust, the upper layer of the Earth, is not always the same. Crust under the oceans is only about 5 km thick while continental crust can be up to 65 km thick. Also, ocean crust is made of denser minerals than continental crust.
The tectonic plates are made up of Earth’s crust and the upper part of the mantle layer underneath. Together the crust and upper mantle are called the lithosphere and they extend about 80 km deep. The lithosphere is broken into giant plates that fit around the globe like puzzle pieces. These puzzle pieces move a little bit each year as they slide on top of a somewhat fluid part of the mantle called the asthenosphere. All this moving rock can cause earthquakes.
The asthenosphere is ductile and can be pushed and deformed like silly putty in response to the warmth of the Earth. These rocks actually flow, moving in response to the stresses placed upon them by the churning motions of the deep interior of the Earth. The flowing asthenosphere carries the lithosphere of the Earth, including the continents, on its back.
Originally posted by Destinyone
Seriously though...all the earth plates are floating on the surface of the planet.
Originally posted by 0bserver1
reply to post by jdub297
Well thats why I put out the question mark , That as if this message has some slight resemblance of the expanding earth theory? I know that if there's more ice , that there will be less water at the equator, But there are in contradistinction of messages that the ice is growing? So why say its the ice?
Originally posted by bjarneorn
reply to post by CLPrime
First of all, the ice at the poles is not merely frozen sea water. It is accumulated "snow" formation over thousands of years. The weight of the ice is thus more then merely the water, that originally was at that particular icecap and presses the water out.
Secondly, the moon-earth system, is not at the equator. And the moon is "tucking" at the water, with such force that it is causing tides.
Thirdly, there are no increasing water levels, to account for the "bulging" of water at the equator that alters the shape of the earth. We would be talking about several hundred meters in water level to account for it.
As I said, this explanation is simply to avoid talking about a growing earth ...
Originally posted by CLPrime
I do understand how tides work, but I fail to see the relevance.
The increasing water levels is from the melting of ice at the poles - as per the scientists' claim.
As for the specifics of the increase in the "bulge" - the actual published article (linked in the InsideScience article) cites a measured change in Earth's oblateness of 3.7*10^-11 per year. In real units, that's an annual increase of about a quarter of a millimeter (one sixteenth of an inch). Hardly several hundred meters.