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).
Best Answer: 555 feet 5â inches (169.294 m) wikipedia: The Washington Monument is a large, tall, sand-colored obelisk near the west end of the National Mall in Washington, D.C. It was constructed to commemorate the first U.S. president, George Washington. The monument, made of marble, granite, and sandstone, is both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 5â inches (169.294 m) in height. It is also the tallest structure in Washington D.C. It was designed by Robert Mills, an architect of the 1840s.