Definition of a Plume. Stress- and dike-based models recognize that the difference between a surface volcano (âhotspotâ) and sills, intrusion, magma chambers and underplating is simply one of the orientation of the stress field, not the absolute temperature of the mantle, or even the magnitude of the stress.
Hempstead is a city in Waller County, Texas, United States, part of the HoustonâThe WoodlandsâSugar Land metropolitan area. It is the county seat of Waller County.
Home Â» Towns Â» Nassau County Â» Hempstead Township. Founded in 1643, the Village of Hempstead is one of the oldest towns in New York state. The Town of Hempstead occupys the southwestern portion of Nassau County, New York. Twenty-two incorporated villages are entirely or partially within the Town of Hempstead. There is also a village of Hempstead located within the town. The Town of Hempstead is 191.3 square miles, 71.4 square miles of which is water.