There are 930 miles of mapped passageways.

Over 390 miles of passageways in Mammoth Cave have been mapped and surveyed.

At least 390 miles of pasageways exist.

With more than 350 miles of surveyed passageways, Mammoth Cave is at least 3 times longer than any cave known. How long might it be? Geologists estimate that there could be as many as 600 miles of yet undiscovered passageways.

More then 390 miles of passageways have been mapped.

Over 390 miles of passageways have been mapped.

I do not know. If you are so curious go and count.

Mammoth Cave National Park currently has about 367 miles of passageways that have been explored.

* Stalactites grow from the top down. * Stalagmites grow from the bottom up. * When they join you have a column. The other forms of speleothems include: * Flowstone * Dripstone * Anthodites * Helicites * Chandeliers * Straws and * Draperies Cave popcorn, snotties and cave pearls also exist and 10 mm cave pearls and larger are special finds for speleologists,

As a verb. The terrain has been mapped for the upcoming incursion.

The entity of the surface of he moon has been mapped. NASA has placed many satellites to orbit the moon and has looked at the moon through telescopes so it has been mapped pretty extensively.

resources which are surveyed and their quality and quantity have been determined for utilisation

Mammoth Cave has about 390 miles, or about 625 kilometers, of underground passages already mapped, far exceeding any other cave system in the world. And that's just what's been mapped -- spelunkers admit they are nowhere near exploring every last tunnel.

Mariner 10 mapped 45% of Mercury back in 1974/75, and Messenger just added another 30% back in January 2008.

Cilia clean air that has been inhaled, or inspired.

It's been surveyed and the volume was estimated at 7,532,750,950 cubic feet.

It is because the house was a stop in the moving of slaves. The passageways helped keep the slaves safe from the slave catchers or bounty hunters who wanted to return them to their slave owner

There is no known statistic, it has never been surveyed, and it would be impertinent to do so.

Yes. Alaska has been mapped, explored, studied and searched for oil and other resources. Hasn't Google Earth mapped everything? One small note, when you go to Alaska, be careful using Google earth maps, the roads are almost all off on the mapping system, use a map purchased in a store instead.

The divorce rate in the US (2000) is 0.41. Several researches have been made, correlating profession with divorce rate, but after checking also with the US Census, none surveyed all professions and their divorce rates. There are several professions that have been surveyed, see more in here http://www.divorcereform.org/cor.html

The entire human genome has been sequenced, but a large majority of its components are still a mystery.

By the best figures, only 2-3 percent of the ocean floor has been properly mapped, at least in regards to the public domain. Certain militaries may be able to claim as high as 10 percent, but those figures are guarded nearly as closely as the other information contained in their files.

When a given piece of land has been surveyed, so that its boundaries are well defined, it can then form a parcel, which just means a piece of land.

Yes. The Bermuda Triangle has been investigated by researchers and paranormal thrill seekers on numerous occasions. Not to mention that the area has been mapped by Google.

It has been scanned by orbiting space probes, so the terrain has been mapped. Other probes have also landed on the planet and taken pictures. It has been explored, but not directly by humans - no human has set foot on the planet.