These speleothems are formed as calcite is deposited on the surface of cave ceilings, walls and floors. The most commonly known speleothems are stalactities, which hang on the ceiling, and stalagmites, which grow up from the floor. Another type of cave in Journey into Amazing Caves movie film are ices caves. Ice caves can form under glaciers. Melting water running under the glaciers or through cracks in the glaciers can erode and melt tunnels or chambers in the ice.
Ice caves can also be caves in rock which have a temperature below freezing all year.
These caves have ice forming on the ceiling, walls and floors. Examples of other cave types would include lava caves , sea caves and sandstone caves . A tube or cave is left when, after the eruption stops, the roof remains intact as the molten rock drains away. These tubes or caves can be large like subway tunnels or small like storm drains. Lava tubes are usually near the surface with openings through the thin roof.