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metamorphic rock

extracting aggregate - Click to enlarge
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Rock altered in structure, composition, and texture by pressure or heat after its original formation. (Rock that actually melts under heat is called igneous rock upon cooling.) For example, limestone can be metamorphosed by heat into marble, and shale by pressure into slate. The term was coined in 1833 by Scottish geologist Charles Lyell. Metamorphism is part of the rock cycle, the gradual formation, change, and re-formation of rocks over millions of years.

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The star represents Islam and expresses peace, harmony, hope, and socialism. The tricolour is reminiscent of the flag of France, the former colonial power. The pan-African colours express unity with other African nations. Effective date: 25 August 1960.

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