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A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption.
Replacing an advertising poster in London using an aerial work platform. An aerial work platform (AWP), also an aerial device, aerial lift, boom lift, bucket truck, cherry picker, elevating work platform (EWP), mobile elevating work platform (MEWP), or scissor lift, is a mechanical device used to provide temporary access for people or equipment to inaccessible areas, usually at height.
Vertical migration of magma is driven by gravity. Stoping occurs when blocks of wall rock material are transferred downward through a pluton. [1] [2] Stoping is an important emplacement mechanism in a variety of tectonic settings and has been widely used to explain discordant pluton contacts. [2]
Upgraded elevators in a HDB block. Lift A (left), built under LUP specifications stops at all floors, while Lift B (right) is usually seen in older IUP/MUP as an aesthetic update that continues to stop at selective floors. Two HDB blocks with upgraded lifts in Toa Payoh. Extra elevators have been constructed, which make up as many as five per ...
Magma chambers above a subducting plate. Magma rises through cracks from beneath and across the crust because it is less dense than the surrounding rock. When the magma cannot find a path upwards it pools into a magma chamber. These chambers are commonly built up over time, [4] [5] by successive horizontal [6] or vertical [7] magma injections
Pyroclasts include juvenile pyroclasts derived from chilled magma, mixed with accidental pyroclasts, which are fragments of country rock.Pyroclasts of different sizes are classified (from smallest to largest) as volcanic ash, lapilli, or volcanic blocks (or, if they exhibit evidence of having been hot and molten during emplacement, volcanic bombs).
Beam-powered climber to an altitude of 1km, Space Elevator Games 2009. [9] Altitude 36,000 km [10] 1km 2009 Speed over 4 m/s (14 km/h). [9] Payload 10kg 2009 Estimated - climber dragged bottom stop about 30m up, with speed over 6 m/s (22 km/h), during the Space Elevator Games 2009. [9] Laser power beaming Power beam 1 kW 2009
The narrow vertical conduit, postulated to connect the plume head to the core-mantle boundary, is viewed as providing a continuous supply of magma to a hotspot. As the overlying tectonic plate moves over this hotspot, the eruption of magma from the fixed plume onto the surface is expected to form a chain of volcanoes that parallels plate motion ...