Question

Over time, flat areas of limestone begin to look like big rough pavements, with lots of gaps. Suggest a reason

Answer 1

Answer:

Explanation:

A limestone pavement is a natural karst landform consisting of a flat, incised surface of exposed limestone that resembles an artificial pavement.[1] The term is mainly used in the UK and Ireland, where many of these landforms have developed distinctive surface patterning resembling paving blocks.[2] Similar landforms in other parts of the world are known as alvars.

Contents

1 Formation of a limestone pavement

2 Notable examples

3 See also

4 References

5 External links

Formation of a limestone pavement

Conditions for limestone pavements are created when an advancing glacier scrapes away overburden and exposes horizontally bedded limestone, with subsequent glacial retreat leaving behind a flat, bare surface. Limestone is slightly soluble in water and especially in acid rain, so corrosive drainage along joints and cracks in the limestone can produce slabs called clints isolated by deep fissures called grikes or grykes[2] (terms derived from a northern English dialect). If the grykes are fairly straight and the clints are uniform in size, the resemblance to man-made paving stones is striking, but often they are less regular. Limestone pavements that develop beneath a mantle of topsoil usually exhibit more rounded forms.

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Answer 2

Answer:

Over time, flat areas of limestone begin to look like big rough pavements, with lots of gaps due to weathering and the impact of precipitation on lines of weakness within the rock

Explanation:

• Limestone is a sedimentary rock. Small rocks and stones are crushed firmly together to form layers that make up the structure.
• Limestone is partially soluble in water, especially in acid rain, so corrosive drainage along the limestone's joints and fractures can result in slabs called clints that are separated by deep fissures called grikes or grykes.
• An advancing glacier exposes limestone that is horizontally bedded by scraping away overburden, and when the glacier retreats, it leaves behind a flat, naked surface that is ideal for the formation of limestone pavements.
• Although some deep grykes are thought to have formed around 30 million years earlier during the Carboniferous period, when the terrain was likely covered with trees, it is believed that most grykes were formed by weathering and the impact of precipitation on lines of weakness within the rock.

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