EDDY Apprentice. Whats the difference between CNC and NC machine and do u people know any institute which teaches CNC programming. #1 Jul 24, 2009. Aashish Joshi Maniac. Engineering Discipline: Mechanical. In a Numerical Control machine, the program is fed to the machine through magnetic tapes or other such media.
A volcano is a vent or chimney which transfers molten rock known as magma from depth to the Earth's surface. Magma erupting from a volcano is called lava and is the material which builds up the cone surrounding the vent. A volcano is active if it is erupting lava, releasing gas or generates seismic activity.
A volcano is an opening in the Earthâs crust from which magma (hot molten rock), ash and gases escape. Volcanic eruptions are driven, in part, by pressure from dissolved gas, much as escaping gases force the cork out of a bottle of champagne.When magma erupts, it is called lava. The type of volcano that forms depends on whether the lava is viscous (thick and sticky) or runny, and on how much gas it contains.If lava is runny, gases escape easily. A runny lava with lots of gas forms fire-fountains that spew into the air and break into globs that solidify as they fall to the ground.olcanic eruptions are driven, in part, by pressure from dissolved gas, much as escaping gases force the cork out of a bottle of champagne. When magma erupts, it is called lava. The type of volcano that forms depends on whether the lava is viscous (thick and sticky) or runny, and on how much gas it contains.