Sea+Caves+and+Arches

__**made by Ryan Carden**__ =__**Sea caves and Arches**__=

**__Sea caves__**:
__**Definition:**__[| A split or hollow opening, usually at sea level, in the base of a sea cliff, formed by waves acting on weak parts of the weathered rock. Also known as marine cave; sea chasm.] **This picture shows what happens to the cliff due to corosion and hydraulic action**. **The next pictures are shown in steps.**
 * Sea Caves** - Sea Caves on the coast of Anglesey ; Mendocino County, California

=__Step 1__=

**The waves hit the cliff walls for a while u****ntil eventually ...** =__Step 2__=

**The waves start to penetrate the wall due to** " Marine processes --- [|hydraulic action] and [|corrosion] which erode along lines of weakness along the wall to form a sea cave "

=__Step 3__= = = The cave slowly enlarges to form an arch. This is still due to the Marine processes listed above. =__Step 4__= **The arche eventually falls because the marinal processes Hydraulic action and corrosion make the sides thinner until the arch's weight is too heavy for the arch to support itself.**
 * This leaves a stack on one side and a cliff again on the other. The stack eventually falls for the same reasons the arch does and forms a stomp.**

=__Arches__= ==__Definition__: [|An opening through a headland, formed by wave erosion (hydraulic action and corrosion) or solution (as by the enlargement of a sea cave, or by the meeting of two sea caves from opposite sides), which leaves a bridge of rock over the water. Also known as marine arch; marine bridge; sea bridge.]==


 * Arches** - Green Bridge of Wales, Pembroke, Wales.--

**The height of an arch can be up to tens of metres __above sea level__ .**


 * A sea arch is a natural opening eroded out of a cliff face by marine processes. Some arches appear to have developed from surge channels, which are created by wave refraction causing the focussing of wave fronts on the side of a headland. More generally, arches develop where waves attack a plane of weakness which cross-cuts a promontory. Caves produced on either side of a promontory may become joined over time to become a tunnel and, finally, an arch.**
 * The supporting roof of the arch is known as the keystone. The architecture of an arch is a reflection of its lithology and structure. Sea arches have been regarded as ephemeral forms tending to survive over periods of just few decades or centuries. The term sea tunnel can be used to describe a hole in the cliff line where the arch itself is considerably longer than the width of the entrance.**

code http://blip.tv/file/get/RCha-CoastalErosionFeatures854.flv code [] here is a video as an example of a sea arch and its where about, with other info on other landforms.
 * (for further information and videos go to this link under sea arches and caves to see the video, it shows the whole process with info below)**
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(**I want to thank this website bellow for the pictures and info it gave me for this presentation. i hope you all enjoyed it.)** http://www.rgs.edu.sg/events/geotrip/stack.html (**the following websites helped provide me with the pictures and info necessary for this sea arch presentation)** [] [] [] Produce a revision wiki page detailing the formation your selected landform  Once you have produced your wiki page you will be asked to review one produced by one of your peers. You should proof read it - changing any spelling and punctuation as necessary.  You should also try and contribute something extra to the wiki page you are reviewing - an additional example, a rProxy-Connection: keep-alive Cache-Control: max-age=0 evant clip from YouTube or Google Video or some additional explanation. ||
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 * ==Title of Coastal Feature ==