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relict; active caves have water flowing through them, relict caves do not, though water may be retained in them.

Types of active caves include inflow caves ("into which a stream sinks"), outflow caves ("from which a stream emerges"), and through caves ("traversed by a stream").

The flowchart starts by asking questions about the cast iron bed of your plane.

I've chosen the bed as a starting point because it has many easily identifiable markings, and it probably wasn't replaced that often.

Hot liquid lava continues to flow under that crust, and if most of it flows out, a hollow tube remains.

Examples of such caves can be found in the Canary Islands, Jeju-do, the basaltic plains of Eastern Idaho, and other places.

The largest and most abundant solutional caves are located in limestone.

Limestone dissolves under the action of rainwater and groundwater charged with H (carbonic acid) and naturally occurring organic acids.

Often these weaknesses are faults, but they may also be dykes or bedding-plane contacts.

The portions of a solutional cave that are below the water table or the local level of the groundwater will be flooded.

Caves formed at the same time as the surrounding rock are called primary caves.

I've converted some of the plane dating information found in Patrick Leach's Plane Type Study into an easy-to-use hypertext flowchart.

Hopefully by answering a few questions about your plane you can determine which type it is.

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