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.
Hemel Hempstead is a city in eastern England. It is part of the county of Hertfordshire and is situated just northwest of London. Just like most town across the UK this one also has its roots going back to the times of the Roman Empire. It used to be a farmers settlement.