RECOMMENDED LESSONS: Runoff Runoff is precipitation that did not get (infiltrated) absorbed into the soil, or did not evaporate, and therefore made its way from the ground surface into places that water collect. Runoff causes erosion, and also carry chemicals and substances on the ground surface along to the rivers where the water ends up.
Noun. 1. obelisk-a stone pillar having a rectangular cross section tapering towards a pyramidal top. pillar, column-a vertical cylindrical structure standing alone and not supporting anything (such as a monument).
Media related to Obelisks of Rome at Wikimedia Commons. 1  Obelisks in Rome (Andrea Pollett) 2  Obelisks of Rome (series of articles in Platner's Topographical Dictionary of Ancient Rome) 3  Obelischi di Roma. 4  Obelisk of Psametik II and Augustus, erected by Pope Pius VI in Piazza Montecitorio. 5  Romeartlover.it: Obeliks of Rome.