disappearing streams
a karst
Obsidian is usually found in caves underground where flowing water hits still lava.
Caves and sinkholes are formed by the erosion of soft rock formations by flowing groundwater. Over time, the water dissolves and carries away the rock, creating these underground or surface features.
a.) Sinkholes b.) sinking streams c.) caverns d.) all of the above
Tautology. that's what it means. Caves are underground by definition!
Caves tend to be underground, you know. They are shy.... Yes there are. Try "caves in Switzerland" in Google or equivalent.
Underground caves are primarily formed by the dissolution of limestone and other soluble rocks by groundwater. This process, known as karstification, is influenced by chemical reactions between the water and the rock, as well as physical erosion caused by the flowing water. Over time, these processes create the intricate cave systems that we see underground.
Caves can also be created by underground water erosion, where water dissolves and carries away rock to form caves in limestone and other soluble bedrock. Additionally, caves can be formed through volcanic activity, such as lava caves formed from flowing lava, or glacier caves created by melting ice in glaciers.
On the floor! E.g. in hollows where dripping water can accumulate. Often in streams as in surface streams. Or as "gour pools" (aka in USA, I think, "rimstone pools") - formed by calcite deposits forming natural weirs in the trickle of water flowing through them. These can be very beautiful.
Regions overlying limestone bedrock tend to have fewer visible groundwater sources (such as streams & ponds), since surface water easily drains downward through permeable fractures and fissures in the limestone
ALL caves are underground by definition. It's where they are! :-)
the moon is not like earth. so there are not any underground caves. it a solid!! duh. Updated answer Since the moon is considered to be part of the Earth and there are caves on Earth. Why cant there be caves on the moon.