Speleology

The Union Cave is located on rout 32. It is below Violet City and east of Azalea Town. It is the second cave you encounter in the game (the first is the Dark Cave entrance above Cherrygrove City). It is the home to Lapras (which only appears on Fridays deep down in the cave) and other Pokemon.

you have to go to island four and go past all of the houses and the last house is islorelei's house. you will see stairs and when you see the stairs you go down and there will be water and u have to surf to get to the cave when you get in to the cave you have to surf again when you get on the water you will see a waterfall go up the waterfall but you have to have a Pokemon that knows how to use waterfall when u get up there you have to you will see a ladder go in the ladder and when you in the ladder u will see a cave go in the cave and u will see lorelei but if u go and don't see her then u came there twice or u have to beat the aleat four

Generally, Carbonic Acid is the agent concerned, though similar weak acids such as Humic Acid, and a small amount of Nitric Acid produced in the atmosphere may also play their part.

These acids gradually dissolve the limestone, and in the case of the Carbonate, are precipitated again as stalactites and stalagmites.

It's called "chemical weathering" - there may be qualifiers that describe specific forms within that such as hydrolysis.

If we told you, it wouldn't be a secret.
Solution caves (which is the kind that most people think of when they hear the word "cave") are found commonly in a type of terrain known as "karst". In the United States, one area with extensive karst terrain is southern Missouri; you can go to the US Geological Survey and get topographic maps which will show the entrances to known caves (there are literally thousands of these in Missouri). Be sure you get the landowner's permission before visiting a cave.
Some caves that aren't "secret" but that you don't need special permissionto visit(you are required to attend a short presentation at the park's interpretive center before entering the caves) are those in Maquoketa Caves State Park in eastern Iowa, which has several caves you can explore. +++ Sorry about my slightly flippant answer but I didn't realise what you meant, because the topic fields have been muddied a bit by references to games, and you'd used a capital S that suggested a proper noun. Also the second answer highlights cave publicity and access arrangementsthat may be particular to parts of America and not known in the UK. We do have cave access controls of various forms in Britain,often perhaps similar to those in Missouri,but the caves themselves are not "secret", so that's a concept unfamiliar to me. I think the US administration of National Parks is very different to that of British ones, too.)

The Mammoth Cave system in Kentucky, USA, is the longest known cave system in the world, with over 400 miles of explored passageways.

i thought there waz gravity everwhere

The scientific name for limestone caves is karst caves, named after the Karst region in Slovenia where many of these caves are found. Karst caves are formed through the dissolution of soluble rocks such as limestone by water.

The only caves that can form dry are;

Rock-shelters eroded out by wind-blown sand.

Talus Caves: voids between landslipped boulders and their parentrock-face.

Mass-movement fissures: formed by a type of landslip.

Lava Tubes - rather stretching the point because they result from molten lava flowing out from beneath a solidified crust.

Caves formed in limestone - as most caves are - arekarst features, i.e. result from dissolution of the rock by weakly-acidic ground-water. Although such caves can subsequently lose their formative streams and so become dry, they were not formed dry and do not develop any further.

i think it,s is gold ....................

Saturn does not generate its own star light, but instead reflects the light of our sun. At 9 AU, 1/9^2 as much solar energy reaches Saturn as Earth. That is a little more than 1%.

There are a few planets which have ice. Earth has ice. Mars is believed to contain ice far underneath its surface. Pluto which is no longer classified as a planet has a surface which is completely frozen.

Look if is solid, is it formed in nature.

you can survive if you look after yourself and do lots of healthy things.

Kentucky have so many dry place and no ocean

the Yucatan Peninsula

At middnight Merlin suffers in the crystal cave

Indiana

The clouds rub together to create a static charge between the water droplets that make up the clouds, which then connects with the highest point for the shortest path to the ground as lightning.

catch a azelf and rome around