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).
Obelisk of Sesostris I, XII dynasty, Middle Kingdom. An obelisk is a stone made monument, much like a column but supporting nothing. Obelisks were erected by Ancient Egyptians for an commemoration.Obelisks were usually made of a single piece of stone. A bird's eye view of obelisk is square and this structure has gradually tapering four sides and its ends in a pyramidal top.belisk of Sesostris I, XII dynasty, Middle Kingdom. An obelisk is a stone made monument, much like a column but supporting nothing. Obelisks were erected by Ancient Egyptians for an commemoration.