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Chapter 5 - Geog

Chemical Weathering

TermDefinition
Chemical Weathering is the dissolving (Melting away) of rock by rain.
The happens when 1. Rain mixes with the carbon dioxide in the air to form a weak acid. 2. This weak acid falls onto the bare rock and slowly dissolves(melts) it away over a long period of time.
The best example of this in Ireland is The Burren in Co. Clare. Chemical weathering has result in a rare KARST landscape forming at the burren.
Karst Landscape is a rare landscape which is found at the burren. It was formed because bare permeable limestone rock was left exposed to rain on the surface and was slowly dissolved.This has created many spectacular features, above and below ground.
Surface features of a Karst landscape 1. Limestone Pavement – rocky surface of a karst landscape made up of clints and grikes. 2.Grikes – deep holes in the pavement. 3.Clints – blocks of limestone separating grikes. 4.Swallow Hole – enlarged grikes where rivers disappear under surface.
Underground features of a Karst landscape 1.Passages – long tunnels. 2.Caves – Enlarged(bigger) passages. 3.Stalactites – Poles coming down from roof. 4.Stalagmites – Poles on ground. 5.Pillars – made when stalactites and stalagmites join together.
Created by: toastiee1