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).
The obelisk is composed of two parts:the body and the pyramidon. The body is a long block of a conic trunk section and the pyramidon symbolizes the rays of the sun. Generally, obelisks have inscriptions on all four sides and also parts of the pyramidon are sometimes carved with bas-relief.