(a) State three characteristics of limestone region
(b) Describe the formation of limestone pillar.
(c) In what two ways is limestone important to man?
(a) * rocks in the region are sedimentary
* the rocks are of organic origin
* absence of luxuriant vegetation
(b) * formed in limestone regions
* formed within a cave
* rain water combines with atmospheric carbon dioxide to form weak carbonic acid
* acidic water dissolves limestone
* dissolution process wears out materials along limestone joints
*joints widen and deepen to make rivers drain underground
*intensification of rock dissolution leads to the formation of underground caves
(c) *raw materials for cement industry
*used as alloy in smelting tin and iron
*provides grazing land
*source of underground water
*beautiful scenery for tourism
*portions of collapsed gorges and caverns are fertile
*provides shelter for refuge in times of emergency
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