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...Presented at short course ix on exploration for geothermal resources organized by unu gtp gdc and kengen lake bogoria naivasha kenya nov electricity generating co ltd introduction to types classification of rocks geoffrey mibei development company po box nakuru gmibei ke abstract generally can be divided into three major based the process their formation these are igneous sedimentary metamorphic formed solidification cooling magma in volcanic areas while low temperature accumulation sediments tectonic basins topographical sinks other hand application pressure pre existing therefore form great depths but exposed surface due erosion epirogenic movements each rock further classified terms chemistry how environment distributions critical regional mapping natural is coined from word ignis meaning fire good indicators volcanism there associated with hydrothermal deposits like porphyry copper gold etc especially organic source coal oil also proxies environmental reconstruction since fossils w...