Denoting the ease with which water can flow through a rock. Related Articles: Glossary: Source rockFlints in the Late Cretaceous Chalk of NW EuropeThe Deccan Traps, India (Part 1): The story of its genesisA field guide to Barbados (Part 1): IntroductionAnother day at the office: Working as a wellsite geologist in the North Sea: a short summary« Back to Glossary Index