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.
What causes Volcanoes? Inside a volcano. Volcanic activity frequently occurs at the boundaries of the Earth's tectonic plates which are a series of large blocks moving between each other. The movement of these plates plays a significant role in the type of volcano formed, which influences its shape.