It seem that gravity and the earths forces on earthly object makes it so air bubbles a round or oval. Perhaps it's easy to realize why air bubbles can not be square in shape.
217390
Everyone says that The surface tension causes the bubble to be spherical. But how? and Why? \n\nLets explain surface tension first- \nIn an air-water interface, the molecules that are close to the surface are attracted by fewer molecules of the liquid than the ones that are NOT close to the surface. The former thus, has less attractive potential energy than the latter, right?\n\nNow, for any matter (solid or liquid), attractive potential energy results in stability & repulsive energy results in instablity (common sense). \n\nSo, it is energetically unfavourable to have a surface for a liquid (or solid) as it results in loss of attractive potential energy.\n\nNow, for that reason, a bubble wants to have the lowest possible surface area to remain stable. Now, using some high level mathematics, someone found out that a sphere has the lowest possible surface area for a given volume. (it is better than a cube atleast).\n\nHence why we can see that the water bubbles and drops tend to be spherical. Due to the effect of gravity, although the drops appear oval in shape but, in the absense of gravity, all the liguid-air surfaces tend to be spherical.\n\nI hope it helped.\nHave a nice day!
492829
As science currently understands the voids you describe, they result from conditions in the very early universe when unequal densities of energy at quantum levels first formed. They are NOT related to explosions.
416381
because the earth is tilted
310667
There would have to be a compelling reason to make wheels that are not round.  If wheels were triangular or square, the ride would be very uneven and bumpy.  Oval wheels would be smooother but still bumpy.  If many sides were used (perhaps a hexagon or more) on the tires for use on a smooth surface, they would cause severe vibrations.  Wheels need not be round if the surface traveled on is not smooth and mates with the new shape, but the extra cost would have to be justified by a new advantage.
139636
In essence eveything's floating as the earth's core is liquid.\n\nThe earth's surface is made up of a series of tectonic plates which float about and bump into each other (earthquakes).  Where these plates meet each other are what are known as fault lines, the San Andreas Fault being one such.  The Asian tsunami was the result of two such plates that had been pushing into each other for many years until the force between them was so great that one plate sprung upwards like a giant spring.\n\nOver millions of years these plates have moved huge distances and continents have drifted apart or been pushed together.  If you look at maps showing the world as it would have been say 1 million years ago it's very different to how it is now.  Likewise, in another million years it will be very different from the world as we know it.
30275
Besides a tasty treat for the physicists...\n\nThe effervescence of the bubbles has been pondered by many a physicists.\n\nhttp://www.stanford.edu/dept/news/relaged/911111Arc1079.html
146487
They float because all the air in there body is escaping which when you blow bubbles nderwater they float to the top same thing with a body except the air can't scape immediatly.  hope this helps your homework
89242
Maybe you have a large ore deposit beneath your location. This could generate a strong field that the polarized molecules would be attracted to. If it's closer to the upper part of the hill and big enough, it could also provide a small amount of gravitational attraction that could be pulling the water uphill.\n\nThe gravitational field of the Earth varies from place to place at the surface. We see this all the time when we take very sensitive readings. It is possible that a gravitational anomalies can be enough to cause odd effects at the surface.
137883
Bubbles are good examples of minimal surfaces. Meaning that they will always attain a shape which gives them the smallest surface area, given the contraints upon them. No contraints (just floatin' free) will always create spherical bubbles for this reason. If you make bubbles stick to some sort of shape, or stick bubbles together, they will create more complex shapes, including some with flat sides (imagine, for instance, two bubbles stuck together, they intersect in a flat circle). So, with the right bubbles and a lot of luck, you would be able to create some rather interesting shapes in the middle of a cluster. But free-floating non-spherical bubbles are an impossibility.
188540
The moon although is a sphere, but it is so far away that it appear a flat round disk. there is nothing strange about this and if people are not educated that moon is a spherical rock, they'd probably think it's a round flat disk.\n\nBut for me, I see it as a hole in the ceiling.
301690
Gravity also curves the instruments. The reason that we dont notice this are many. One is that Since we are part of this very space time and that we refer to the curved spacetime to check the curveness of the instrument are the prime reasons
418611
Your puzzle is explained in part by the thermodynamic behavior of air.  \n\nWhen a 'pocket' of air is heated, its density decreases relative to the surrounding atmosphere, and so it begins to float upward.  As the hot air rises through the troposphere, the pressure around it drops, because there is less air and more available space to fill.  The volume of the hot air expands as a result, but this expansion progressively drains the heat from the air, through a process called 'adiabatic cooling.'  In the end, the air pocket is dispersed, its temperature dropping far below the air temperature at the Earth's surface.  This process happens constantly, all over the atmosphere, and is one factor contributing to the overall 'lapse rate' of the atmosphere (the rate of temperature decline as altitude increases).
503078
probably gravity. it's the most likely. without gravity there would be no wind, running water or sea waves. think about it for a second it'll make sense
22385
because of gravity, pulling inward with the same force in all directions, giving them a round shape.\n\nyou look very pretty in your avatar by the way ;)
659577
It seems flat to me.  However, when I peer intently  at lines of clouds over a real-long horizon I detect a curl this way and that, like it's following some sort of curvature of the surface in a distant kind of way.  It's really spooky.  But you include the question "Was it ever round?"  So if you want more on the subject, listen to Phil Hendrie on xm radio channel 152, and sometimes he has a guest General Johnson Jameson, who attempts such inquiries.  As an added bonus, a few conversations about a society of small people who live in a magical land.
274172
You've probably seen the pictures of a grid with a giant funnel extending infinitely downward.  That's not the shape of the hole itself, but a map of the curvature of space near the singularity.  The singularity, or "hole" itself is a point of infinitely large density and infinitely small size.
484164
Gas, air, the atmosphere - it's made up of molecules of gas, each of which has mass.  That mass is attracted to the Earth by gravity.  Light as air is, it still has mass that it captured by Earth's gravity.  When an asteroid  comes along and smacks into the Earth, water vaper and air are throw far out into space, several hundreds of miles (the atmosphere is only about 100 miles high).  However, it all comes back due to the force of gravity.\n\nHowever, Earth's gravity is not strong enough to hold the lightest elements, hydrogen and helium.  That is the reason Earth is a small rocky planet and not a gas giant like Jupiter or Saturn, or even the sun.  Get big enough and you can attract even the lightest elements - which adds mass - which attracts more gas - which adds more mass - etc etc etc.\n\nThat's why your idea, unfortunately, won't work.  Gravity.