0
Caves, and other karst features, are produced because limestone is soluble in water containing dissolved carbon dioxide and organic acids. Rain picks up atmospheric carbon dioxide as it falls. On passing through the soil more carbon dioxide, from plant roots and decaying vegetable matter becomes dissolved in the water, along with complex organic acids called humic acids. This ground water is easily able to dissolve limestone.
phreatic conditions result in three dimensional solution either forming large dome-shaped chambers or complex three dimensional mazes. The rock may become like a Swiss cheese producing what is called spongework.
+++
With respect, you've summarised cave formation but forgotten to define "phreatic"!
A phreati passage is one formed by dissolution as above but withinthe saturation zone of the rock mass' i.e. entirely filled withwater underhydrostatic pressure.Because the passage is totally filled the rock is attacked on all its exposed surface,so creating characteristically circular or elliptical passage sections.
What else can I help you with?
What is virgin cave or virgin cave passage?
A cave or part of a cave that has not been visited by people in "recorded history." For example, if a cave explorer finds what appears to be newly unexplored passage, but then happens upon a petroglyph or an arrowhead, then he or she could claim, they were in virgin passage. ( The petroglyph or tool may be of neanderthal origin, and would therefore, not count as human visitation. ) However, normally a virgin passage shows no sign of human visitation at all. If it could be proven that any footprints were hundreds of years old; then it would be noted by the discoverer that "the passage appeared to be virgin with the exception of footprints left by a native inhabitants of the region."
Do speleologist explore a new cave passage before mapping it?
It is accepted practice in the speleology community that if you believe you are in unexplored passage, that you should take the time to survey it properly before continuing down the passage. There are a few exceptions to the rule. Such as, you were not expecting to find virgin passage and didn't bring survey equipment. If your intentions are to map the passage later, then a short scouting trip up the passage will give you a good idea what survey gear will be needed. You won't get much credit for the discovery of the cave or passage unless you publish a map of it in a caving journal.
What do you call the parts of a cave?
The main parts of a cave include the entrance, passage, chamber, and sometimes a sinkhole or dome. These parts can vary depending on the type of cave and how it was formed.
What are the parts of a cave?
A cave typically consists of an entrance, a main passage, chambers or rooms, and sometimes secondary passages like tunnels or shafts. The entrance is the access point to the cave, while the main passage is the central corridor that connects different chambers. Chambers are larger spaces within the cave that may vary in size and shape.
If a lava tube cave is just below the surface then how can one be considered a deep cave?
Cave depths are measured from the altitude of the upper most portion of the cave with the altitude of the lowest portion of the cave passage. In the case of a lava tube cave, the passage is related to the lava flowing down the slope of the landscape. Since a lava cave can be over 8 km long, it is possilble that the upper portion of the cave is over 300 meters higher than the lower portion of the cave. It can be very strenous to travel from the top of such a cave to the bottom and possibly back out the entrance from which you came. Ref: http://www.caverbob.com/lava.htm
What does a collasped cave form?
A shake-hole, sink-hole or doline. The collapse may also form an entrance to the cave below, if the slumped material has not filled the passage.
Significance of Cave episode in Foresters A Passage To India?
discuss the cave episode in A Passage to india ?
What is the most likely meaning of the underlined word in this reading passage?
he cave entrance
What is a 4 letter underground passage?
It's a cave.
Where is the secret passage in the cave on imagine town?
there is a big rock around the middle of the cave then you click it
On sims 2 castaway how do you get into the secret passage in the dark cave?
Behind the kings throne there is a crown that is wht u use to open the passage in the cave. Good luck
What is virgin cave or virgin cave passage?
A cave or part of a cave that has not been visited by people in "recorded history." For example, if a cave explorer finds what appears to be newly unexplored passage, but then happens upon a petroglyph or an arrowhead, then he or she could claim, they were in virgin passage. ( The petroglyph or tool may be of neanderthal origin, and would therefore, not count as human visitation. ) However, normally a virgin passage shows no sign of human visitation at all. If it could be proven that any footprints were hundreds of years old; then it would be noted by the discoverer that "the passage appeared to be virgin with the exception of footprints left by a native inhabitants of the region."
Where is the mythic skull in Halo 3?
When you start out on the mission:Halo, you will see a cave kinda place strit in front of you. When you enter the cave, just stick to the right wall of the cave, and you will find a hidden passage, and at the end of the passage is the skull.
Where is the secret passage on go vacation on the mountain resort?
the cave
How much does it cost to get in to Mammoth Cave?
$3:50 for mammoth passage
Most common flat ceilings or pointed in caves?
An interesting question: I don't know that anyone has studied the statistics! Sticking to caves in limestone - the most numerous by far - it's more accurate to consider the entire cross-section of the passage. Karst cave passages develop along joint and bedding-planes - also faults but leave them for now. Initially the water dissolving the limestone occupies the whole passage volume, from its start as a minute micro-conduit. In these "Phreatic" conditions erosion takes place place along roof, floor and walls at the same time. If the guiding conduit is along a joint, the passage becomes a tube of circular cross-section. If the guide is a bedding-plane, or the intersection of joint and bedding-plane, the passage becomes elliptical as the water spreads itself into the bedding-plane on each side of the conduit. In some circumstances under phreatic conditions a layer of sediment can protect the floor from dissolution, and the passage tends to develop upwards into the joint, giving a tapering or "pointed" roof. If the roof is an insoluble "aquiclude", phreatic passages are flat-roofed - the udnerside of the aquiclude. The water will also tend to spread out below the insoluble bed to form a network of small tubes, with one eventually becomg dominant. An example familiar to me is Blacknor Hole, in Portland, (Southern England), where the aquiclude is a tabular chert band about 100mm thick within the Jurassic-age Portland Formation of limestone. On the other hand, a thin bed of resistant micrite called the Porcellaneous Band influenced many caves in the NW Pennines (Northern England), particularly Gaping Gill, to give a series of flat-floored, semi-circular phreatic passages on its upper surface. If the cave's formative stream abandons phreatic passages relatively quickly their tubular cross-sections remain intact. If though the cave's outlet level falls, typically by down-cutting of the landscape holding the springs, the cave's stream level falls to leave air above it. This is called the Vadose Phase. Now the water can attack only the walls and floor, principally the floor, and a vadose Canyon of key-hole cross-section may for. The "stem" of the keyhole is the original cylindrical phreatic tube, called the passage's 'precursor'. The section may resemble a letter T, with an arched roof, if the precursor was a bedding-plane. Sometimes bedding-plane passages can be very wide. The largest in Porth yr Ogof (South Wales) is nearly 30m wide at its widest, but not much more than 2m high, with an unusually flat roof. In very old caves, the beds in the roofs of large passages and chambers may collapse in stages to develop a cantilevered arch. To go back to passages on faults (major tectonic fractures extending throughout the rocks, often from crust upwards). The way in which a fault forms shatters the rock on each side of the fault plane, giving ready access to the water. Such passages are marked by roofs of breccia and often obstructed by fallen angular boulders. So to summarise... there is a variety of passage forms, with little or no prevalence overall of one type over the other; and the actual shape and size of a cave passage is highly individual.
What type of cave is the cave of swallows BESIDES pit?
pit cave, shaft cave or vertical cave. it is a type of natural cave which contains one or more significant vertical shafts rather than being predominantly a conventional horizontal cave passage
