Volcanoes form at two different types of boundaries between tectonic plates on the Earth's crust: subducting and constructive. Subducting boundaries appear where one plate slides beneath the surface of the other while constructive boundaries slide along one another from side to side rather than colliding. Also, other hot spots on the crust lead to volcano formation as well.Know More
Many of the world's volcanoes sit on the "Ring of Fire." This rim runs up the west coast of North, Central and South America, down the eastern side of Asia, through Indonesia, and then down along New Zealand. This rim follows the boundaries of the Pacific Plate, which is the bed of the Pacific Ocean, with other continental plates. Along the "Ring of Fire," earthquakes are also common as the plates collide with one another.
Eruptions of volcanoes are often as difficult to predict as earthquakes. At places where plates join or when cracks form in plates, magma can ooze up through the fissure that forms; however, at points where one plate slides under the other, the mantle can melt, pushing magma upward and forming pressure under the crust. When the pressure gets high enough to create a crack in the crust, the magma spews forth, creating a volcanic eruption.Learn more about Volcanoes
Volcanoes can form anywhere the Earth's crust allows magma to reach the surface. Typically, this occurs around plate boundaries, either where plates are pulling apart or where one is forcing its way under another. Weak spots can also develop away from plate edges, creating magma vents called hot spots.Full Answer >
Commonly, volcanoes form at points where the Earth's crust is thinnest. This is normally near fault lines, but has been known to occur in the middle of tectonic plates or even in subduction zones, where one plate is pushing another plate down under it.Full Answer >
A volcano occurs when molten rock wells up from the mantle to breach the Earth's crust. Most commonly, this occurs around the edges of tectonic plates. When two plates collide, one may slide underneath its neighbor, opening a channel for magma to reach the surface. If two plates pull away from each other, the resulting gap may allow multiple channels for magma to escape.Full Answer >
Volcanoes occur when molten rock from underneath the Earth's crust rises up. This molten rock comes from the mantle, not from the Earth's core. Because of plate tectonics, volcanoes can form relatively quickly.Full Answer >