because if they were made of soap they'd dissolve
The vast majority of the world's caves are in limestone.
For most caves, in limestone, sufficient precipitation over sufficiently long time - but cave development also depends the region's geology and geomorphology.
Precipitated as stalactites, stalagmites etc - and it is the primary constituent of the limestone in which the vast majority of caves form!
The majority of aves are made up of limestone Stalagmite rocks
Feldspar is a constituent of igneous rocks, primarily granite, and does not form rock masses alone. Also, although it does weather, very slowly, neither it nor the igneous rocks generally have the solubility of limestone. Caves do form in granite etc by subaeriel, sea or riverine erosion, but they are generally small, shallow rock-shelters, not conduits as in limestone caves.
Caves most commonly form in areas with limestone or other soluble rocks that are easily eroded by water. The process of cave formation typically involves the dissolution of rock by acidic groundwater, creating underground voids. Over time, these voids can develop into large cave systems through ongoing erosion and geological processes.
Limestone caves are formed through a process called karstification, where rainwater picks up carbon dioxide from the air and soil, creating a weak carbonic acid. This acidic water dissolves the limestone rock over time, creating underground cavities and passages. As the water drains away, it leaves behind caves and unique formations such as stalactites and stalagmites.
Limestone is the rock that is in Caves. When carbonate acid is reacted to the limestone in the caves, it will corrode forming strange caves landforms.
by limestone
Most caves are found in areas with limestone bedrock, as it is easily dissolved by water, creating caves through a process called karst topography. These areas include regions like Kentucky in the United States, parts of China, and the Yucatan Peninsula in Mexico.
Other way round! Water and/or air are in caves.:-) Most of the world's caves have formed / are forming in limestone.
Mainly limestone.
Most caves are made from limestone because limestone is a sedimentary rock that is easily dissolved by water. Over time, acidic groundwater seeps into the cracks and crevices, dissolving and eroding the limestone to form cave systems. The process is known as karstification and is responsible for the creation of many limestone caves.
generally, in limestone uplands, where the limestone is sufficiently massive to hold caves, and particularly but not exclusively where the local surface drainage can concentrate rainwater into discreet streams than can then form sink caves when they flow onto the limestone.
The vast majority of the world's caves are in limestone.
Air! :-) A cave is a natural void in rock, and the rock in which thevast majority of the world's caves form is limestone.
They don't! Deposits don't form caves, but limestone is a sedimentary rock formed from marine or lacustrine deposits. Caves form within limestone by dissolution of its calcium carbonate by ground-water flowing through the rock's joints, bedding-planes and faults.