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Geo
Chapter six,limestone pavement,(surface+underground features)
| Question | Answer |
|---|---|
| Step 1 limestone pavement formation | Rainwater falls on exposed limestone and passes through its joints |
| What are joints | Long vertical cracks in. Limestone rock |
| Step 2 limestone formation | Carbonation makes joints wider by dissolving the calcium carbonate in limestone until they look like grooves or gaps. |
| Why are the grooves/gaps called in limestone | Grikes |
| What are Clints | Blocks of limestone left in between grikes are known as Clints |
| What is a swallow hole | Rivers that flow over a limestone surface can disappear underground through a swallow hole, |
| Step 1 swallow hole formation | As river flows over limestone,water widens joints on rock through carbonation |
| Step 2 swallow hole formation | Eventually,river dissapears from surface,and begins to flow underground along the bedding plates |
| What are bedding plates | Bedding plates are the horizontal spaces between layers or strata in limestone rock |
| Step 4 swallow hole formation | Carbonation and hydraulic action enlarge joints and bedding plates |
| Step 5 swallow hole formation | River continues to flow underground,this helps form underground karst features e,g passages or caves |
| What size are swallow holes? | Swallow holes vary in size depending on how large or small the river is |
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