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).
Many Western cultures have also given them central importance. The Washington Monument is in the form of an obelisk. The obelisk is one of the Westâs oldest monumental art forms, with some of the most continuity. So weâll explore some of the most plausible ideas about its meaning and construction. 1. Obelisks were first built around the time the sun cult of Re became central in Heliopolis in the 4th Dynasty.