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Crater - The upper part of the vent is often a cup or a saucer shaped depression, Igneous Rocks - Formed through solidification of volcanic material, Minerals - naturally occurring substance having a definite chemical composition, Metamorphic Rocks - Means alteration or transformation, Vent - The narrow opening of a volcano, The Arabs built a vast Islamic Empire under his rule - Muhammad bin Qasim, Muhammad bin Qasim invaded Sind in - 712 A.D., Caliphs - The successor of Prophet Mohammed, Feudatories - The heads of the estate.,
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