Why do many caverns form in limestone?

Answer 1

Because limestone is soluble and is comparatively easily dissolved by water which contains weak acids.

Due to limestone's different features: it is pearmeable, it can be dissolved by slightly acidic water and yet it is very strong. Water can seep into the limestone then erode it, eventually forming a cave or cavern.

Answer 2

because the limestone grew on land... [Sorry - that's wrong. It's a sedimentary rock formed under water, usually on shallow, warm sea floors, before being uplifted to form uplands by tectonic processes]... and is soft [ Some limestone is fairly soft, but not all] and easily eroded by water and acids forming caves. ... [The acid is the point: rainwater absorbs atmospheric carbon-dioxide to produce the weak carbonic acid that dissolves the limestone irrespective of the rock's hardness.]

Answer 3

its because limestone weathers very easily and when it erodes away it leaves a cave (also see stalactites and stalgmites but if you want more on limestone)

A specific form of weathering: chemical. The calcium carbonate mineral that is the primary and essential constituent of limestone is soluble in water made slightly acid by absorbing atmospheric carbon-dioxide. So caves form in limestone because limestone is dissolved away.

Very slowly - I think rates of 1mm or less per 1000 years are fairly typical in temperate climates, but it does depend on other factors such as precipitation and the absorption of biological acids from the soil.

Answer 4

Because Limestone is nearly insoluble in pure water. But water that contains small quantities of carbonic acid dissolves easily.