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Hi all,
Vanilla are planning an update to the site on April 24th (next Wednesday). It is a major PHP8 update which is expected to boost performance across the site. The site will be down from 7pm and it is expected to take about an hour to complete. We appreciate your patience during the update.
Thanks all.
Vanilla are planning an update to the site on April 24th (next Wednesday). It is a major PHP8 update which is expected to boost performance across the site. The site will be down from 7pm and it is expected to take about an hour to complete. We appreciate your patience during the update.
Thanks all.
Notes etc. - Do not post copyright material
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F: An example of weathering is Freeze-Thaw Action`
E: When you get higher up it gets gradually colder. Near the peak of mountains it is above freezing temperature by day and below freezing by night. Water seeps into cracks in the rocks in the day. At night, the water freezes and expands, putting pressure on the rocks. Over time, the process continues, weakening the rock and making it collapse. The collapsed rock then gathers at the base of the slope, and is called Scree.
E: An example of this is Croagh Patrick in Co. Mayo
F: Limestone Pavement
E: Rainwater falls onto the exposed limestone. This rainwater then passes through vertical koints in the limestone. Carbonation then causes weathering of both the entire surface and the joints, and they become wider as a result. This creates gaps called grikes and the blocks that are left in between the grikes are called clints.
E: The Burren, Co. Clare
F: Swallow Hole
E: Rivers can dissolve limestone. A river which may begin in a non-limestone area, can disappear underground when it reaches a limestone surface. This occurs because the water widens the joints and bedding planes of the limestone rock through carbonation.
The river will then disappear underground through a swallow hole. Swallow holes vary in size, depending on how large or small the river is.
E: Pollnagollum swallow hole, The Burren, Co. Clare
F: Stalactites
E: As water seeps through the rock, it carries dissolved limestone with it. It eventually reaches the roof of a cave. The drops evaporate, leaving small deposits of pure limestone called calcite behind. Gradually the calcite builds up to form stalactites.
E: Ailwee Caves
F: Soil Creep
E: Soil creep is the movement of soil down a slope under the influence of gravity. It is the slowest form of mass movement, and becomes evident only when you examine the landscape closely. As the soil moves downslope, a series of steps called terracettes can form, giving the surface a wrinkled appearance. Trees grow at an angle, with the base of the tree turned downslope Walls crack and break when soil piles up behind them. Fences and telegraph poles bend or tilt downhill.
E: Clare-Island, Co. Galway
F: Bog Burst
E: A bog burst occurs when a mass of bog or peat moves down a slope after a period of heavy rainfall. The peat becomes saturated, and water can no longer soak downwards. The peat moves downslope and can block roads, knock down trees, damages roads and buildings, and pollute lakes and rivers.
E: Derrybrien, Co. Galway/Mayo
F: Mudflows
E: Mudflows occur when soil and regolith become saturated with water, and move downslope like a river of mud. They are the fastest form of mass movement and can reach speeds of over 100km per hour. Mudflows can occur after periods of heavy rainfall, or in the aftermath of a volcano In snowy regions, a volcanic eruption will cause snow and ice to melt quickly. This meltwater mixes with ash, soil and rock to create a particularly dangerous form of mudflows which are called lahars
E: Nevado del Ruiz, Colombia
Alright, I think that's enough for now. This is my first post so I thought I might as well make it useful. If anyone needs anymore more of these let me know and I'll see what I have
Btw, they are supposed to be F.E.E.D's (Feature, Explain, Example, Diagram) but I don't know how to insert pictures so you'll need to find those online. Hope I helped! 0 -
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