Limestone

Limestone is an organic, sedimentary rock.It was formed from the remains of tiny shells and micro-skeletons deposited on the sea bed. They were compressed to form solid rock. Limestone is made up of calcium carbonate and reacts with diluted hydrochloric acid. Limestone is formed in layers – called bedding planes. These bedding planes contain vertical cracks called joints. Joints and bedding planes make the rock permeable.

Weathering of Limestone

Weathering is the breakdown of rock by physical, chemical or biological processes. Limestone areas are weathered when rainwater, which contains a weak carbonic acid, reacts with limestone. When it rains limestone is dissolved. Rainwater erodes the joints and bedding planes. In doing this Karst scenery is created.

Karst scenery includes:

Swallow hole – An exposed limestone joint down which a surface river ‘disappears’.

Clints and grykes – Rainwater flowing over an impermeable surface will, on reaching (permeable) limestone, be able to dissolve the joints into grooves called grykes, leaving blocks or clumps of limestone in between called clints.

Stalactite – Water dripping from the roofs of caves leave behind microscopic particles of calcium carbonate. These build up as icicle shaped stalactites.

Stalagmite – Drips splashing onto the floor of caves leave behind microscopic particles of calcium carbonate. These build up on the floor of caves.

Limestone and recreation

Limestone areas are popular due to the range of leisure activities that people can participate in. These include walking, pot holing, climbing and abseiling.

Source:http://www.geography.learnontheinternet.co.uk/topics/limestoneinfo.html#lime

Further Readings

Limestone Caves

Limestone Topography

Weathering is the breakdown of rock by physical, chemical or biological processes. Limestone areas are weathered when rainwater, which contains a weak carbonic acid, reacts with limestone. When it rains limestone is dissolved. Rainwater erodes the joints and bedding planes. In doing this Karst scenery is created.
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About Rashid Faridi

I am Rashid Aziz Faridi ,Writer, Teacher and a Voracious Reader.
This entry was posted in Landforms, Minerals, rocks. Bookmark the permalink.

7 Responses to Limestone

  1. This is interesting, Rashid! I’m NOT a geologist, but in writing about the Underground River, I learned and mentioned that the geology of the area is limestone karst. Here’s your article that perfectly describes how that Wonder of the Natural World came to be. Great to learn! Thanks for this.

    Like

  2. Asif says:

    Sir
    I am presently doing my PG in geography
    Will you please give me some suggestions to qualify in ugc-cbse net December 2014

    Like

  3. Nice article says:

    I enjoy reading through a post that can make people think. Also, many thanks for allowing me to comment! Also i find the below website are usefull for UGC NET preparation https://www.facebook.com/groups/ugccbse/ and http://www.gatecseit.in/

    Like

  4. Pingback: Rocks | Rashid's Blog

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  6. Pingback: Karst Topography – geomorphologyclassblackboard

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