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- Volcanoes erupt because of the way heat moves beneath Earth ’s surface. Heat is conveyed from the planet’s interior to its surface largely by convection —the transfer of heat by movement of a heated fluid. In this case, the fluid is magma —molten or partially molten rock —which is formed by the partial melting of Earth's mantle and crust.
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Why and how do volcanoes actually erupt? Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth's mantle melts. Melting may happen where...
- 1 min
Nov 12, 2023 · Learn about the factors and processes that trigger volcanic eruptions, such as heat, pressure, and tectonic plate boundaries. Explore the types, significance, and examples of volcanic activity on Earth.
Aug 20, 2015 · Learn about the different processes that trigger volcanic eruptions, such as subduction, magma movement, and pressure changes. Find out how science can predict and explain these natural events.
Learn how magma, lava, and tephra are related to volcanic eruptions. Find out how the composition and pressure of magma affect the explosivity and danger of eruptions.
The Hawai’ian hot spot causes magma to rise and erupt as lava on the ocean floor. Over millions of years, the Pacific Plate has moved over the hot spot, creating a chain of volcanic islands. This simple schematic diagram shows the movement of the tectonic plate (light brown) over a mantle plume, or hot spot, to produce a chain of volcanic ...
Nov 29, 1999 · Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a...
