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.
Waller County, Texas. Waller County is a county in the U.S. state of Texas. As of the 2010 census, the population was 43,205. Its county seat is Hempstead. The county was named for Edwin Waller, a signer of the Texas Declaration of Independence and first mayor of Austin. Waller County is included in the Houston-The Woodlands-Sugar Land, TX Metropolitan Statistical Area.