interpolatoryinterrill erosioninterropical convergence zoneinterruptabilityinterrupted streamintersticeintertropical convergence zoneintertropical frontintitia lossintitial detentionintrazonalintrinsic permeabilityintrograde erosioninventroy suveyinverse approachinverse probleminversioninversion cloudinversion layerinversion rainfallinvertinvert slopeinverted siphoninvertibleionosphereirrigating streamirrigationirrigation requirementirrigation siphonirrigation systemirrotational flowirrotational motionisallobarisallobaric windisallothermislamic republic of iran meteorologicaliso aeoloerodent mapiso pluvioerodent mapisobarisobar lineisobaric chartisobaric processisobaric surfaceisobathisochionisochron mapisodistanceisohyetisohyetal lineisohyetal map