what is a block hole?
486832
A black hole is a concentration of mass great enough that the force of gravity prevents anything past its event horizon from coming out of it. A black hole may be a huge star more than 6 times the mass of sun or other huge concentrations of matter.\n\nIt has a gravitational field so strong that nothing even light,the fastest thing known to humans cant escape from its garvitational power. for more try http://en.wikipedia.org/wiki/Black_hole
536335
depends what blocks they've got. there is a program that when booted from a usb drive will reset the admin password, allowing you access to the account, and therefore able to disable the blocks from there
982722
Vestibule: a passage way acting as an airlock between two environments.\nHave a look at this...\n\nhttp://www.newyorker.com/printables/talk/050103ta_talk_parker
143766
Simple!  A manhole is round so that the cover can never fall in.  If it were any other shape, like a square, rectangle or oval, you could take the cover out, flip it sideways and drop it in, but with a round hole and a round cover, it will always be just a little too big.\n\nPart 2:  I would still call it a hole if it was square.  Why wouldn't you?  Plenty of holes aren't round.  Button holes are very narrow compared to their length.  And I guess the Indian Government aren't concerned with people dropping manhole covers into a sewer, or didn't think about it.
113315
Either a blockhouse or a stockade.
11368
Once the drill is removed and the pressure allowed to escape, the void is usually crushed due to the weight of the rock around it.  However, if the drill is removed and the void is still active, it is possible for water and/or oil to fill up the void fast enough to minimize the impact of the collapse; but in the end, even with an active void, the area collapses and fills with rock.  \n\nIn general this isn't a problem, as oil companies tend never to pump an entire void dry, allowing it fill naturally again for further drilling.  So, the geographical affects are negligable.
636401
nothing at all??!!! man u're hole is blocked!!
833341
An open plug hole in a bath full of water. All the water is captured by the plug hole. Nothing escapes.\n\nBlack holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned out stellar remnant. With no outward forces to oppose gravitational forces, the remnant will collapse in on itself. The star eventually collapses to the point of zero volume and infinite density, creating what is known as a " singularity ". As the density increases, the path of light rays emitted from the star are bent and eventually wrapped irrevocably around the star. Any emitted photons are trapped into an orbit by the intense gravitational field; they will never leave it. Because no light escapes after the star reaches this infinite density, it is called a black hole.
678881
You can't dig half a hole.
421276
Like a penny with a hole in it.
5756
a 'brick' is a badly missed shot -- more specifically one that hits the rim hard. air balls and shots that just miss around the rim are not normally called bricks, but some people will call any shot a brick.
372254
So the manhole cover can't be accidentally dropped into the hole.  If it were square or rectangular then the cover could be turned at an angle and dropped into the hole.  Would you appreciate your coworker doing that while you are crawling around fixing some power cable?  A round cover is also much simpler for the workers to roll out of the way once they have removed it from the hole.\n\nPS.  An equilateral triangle is a shape that cannot fall down into the hole if it has a small lip around it similar to a round manhole cover, but this shape is much more likely to have the corners pop up when a vehicle runs over it and is much more difficult to roll.
598922
saddle blocks are used on the area that would hit the saddle on a horse.
580033
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.
815455
blocked pores and bacteria.
157896
There are a few possible answers;\n-Some shells have holes in them because part of the creature's body protruded there; Keyhole limpets, for example.\n-Some shells may have been drilled by a parasite or a predator, for example, whelks have a rasped tongue-like organ called a radula - they use this to bore holes in the shells of other animals in order to devour them.\n-And some shells may simply have eroded naturally so as to have a hole in them.
902837
blockhead probably means idiot. .