abi - barbados limestong landscape

Barbados Its all about the Lime (stone) : 

Barbados Its all about the Lime (stone)

Slide 2: 

We have found out that limestone is Calcium Carbonate and is affected by Carbonation. That chemical weathering occurs here and is increased by the heat and humidity (climatic) Limestone landscapes look different in cooler climates (more angular and rugged) than those in the tropics which are more rounded. A limestone landscape is called a Karst Landscape

Slide 3: 

Good animation

Various Limestone landscapes : 

Various Limestone landscapes Tower karst – Guilin, China Clint and Grike limestone pavement, Galway, Ireland Cockpit Karst - Jamaica One thing about all Limestone is that it can be described as MASSIVELY JOINTED I.e. its got lots of cracks in it. This leaves weaknesses which are then weathered faster. Look at the picture above and try and explain why the limestone is like this.

Some limestone features Barbados may have : 

Some limestone features Barbados may have Dolines – These are depressions formed by the collapse of caves. They can be up to 30 metres in diameter Swallow Holes or Sinks – depressions with openings caused by solution of limestone or cave collapse. Rivers can sink into them and form as Resurgent Streams where they reach the impermeable layer. Dry Valleys – many of the gulleys are dry valleys. The way Barbados dry valleys was created may be different to other areas. (Tasks - find examples of these with photos and add them to your Google Map with explanations)

Underground Features : 

Underground Features Task – discover how stalactites and stalagmites are formed. Give as much information as you can about them and add it to your Google Map relating it to Harrisons Cave.

stalactites : 

stalactites The carbon dioxide dissolved in the rain water droplets and attacks the limestone rock, which is made mostly of calcium carbonate. As a product of this reaction, the newly formed chemical also called calcium hydrogen carbonate, an extremely water soluble compound. While on the roof of the caves bicarbonate filled water is filtered, the carbon dioxide is released, and the resulting calcium carbonate precipitates. The newly precipitated calcium carbonate starts forming concretions around the falling point of the droplets towards the cave's floor. A stalactite starts with a tiny ring of calcite deposited by the falling water droplets. In time, the deposits build a very narrow (0.5 mm), hollow tube called "soda straw" stalactite, which can be very long, but easy to break. Further calcite deposits left by water build the typical cone-shaped stalactite. http://news.softpedia.com/news/How-Do-Stalactites-Form-74093.shtml

stalagmite : 

stalagmite A stalagmite is a type of cave formation that is is a mineral formed from a minerals of the caves that rises from the floor of a limestone cave due to the dripping of mineralized solutions and the deposition of calcium carbonate. This stalagmite formation occurs only under certain pH conditions within the underground cavern. http://en.wikipedia.org/wiki/Stalagmite

Human Impacts on the Limestone landscape : 

Human Impacts on the Limestone landscape Look out and take photos, research articles of how humans affect the limestone landscape of Barbados. It can be Building industry: Blocks or How limestone is quarried and used for cement. Effect of Agriculture and erosion, Deforestation Building over cave systems (google the Brittons Hill cave collapse) Add all these to your Google Maps

Soil in Limestone Areas : 

Soil in Limestone Areas