District Manager | Median Annual Salary: $72,402. Salary outlook: Retail district managers at Walgreen Co. can make an average $128K and Sears Holdings Corporation, CVS Caremark Corporation and Family Dollar Stores Inc. are some of the top-paying firms where district managers see a range of $88K to $114K.
Volcanic eruptions are caused when magma from the magma chamber of the Earth rises up the pipe and out of the vent.Magma is continuously supplied from the mantle of the Earth. Shield volcanoes usually have a gentle eruption, as it contains basic lava.nother type of eruption in what is known as a boiler volcano results from water that gets trapped inside porous rock, and is then heated by the mantle, until is turns into steam and the steam pressure causes the volcano to explode. These explosions can be extremely large.
A volcanic eruption is both an international pollutant source and an international hazard. The United States Geological Survey states that âVolcanoes produce a wide variety of hazards that can kill people and destroy property.uring a volcanic eruption a mixture of gases and particulates are expelled. The discharge of gases can also occur between major eruption events; volatile gases such as hydrogen fluorine(HF) and carbon monoxide(CO) trickle out of cracks and fissure along the surface of the volcano (SDSU, 2000).