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).
An unanticipated problem was encountered, check back soon and try again. 1  2. AN OBELISK WAS USED IN THE FIRST CALCULATION OF THE CIRCUMFERENCE OF THE EARTH. 2  3. TRUE OBELISKS ARE MADE OF A SINGLE PIECE OF STONE. 3  4. THEY WERE REALLY, REALLY HARD TO BUILD. 4  5. AN OBELISK HELPED ARCHAEOLOGISTS TRANSLATE HIEROGLYPHICS.