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Places where plates crash or crunch together are called convergent boundaries.
convergent boundary
Collision, Mountains, Ridges. I think that is what you are asking. :)
Tectonic plates are the plates that move underground and cause volcanoes - I hope this answers your question. Z
Mountain ranges, such as the Himalayas, were formed when 2 plates collided. When 2 tectonic plates crash together, the force pushes the plate boundaries upward and create mountains. So, mountains are formed by convergent plate boundaries. By, Heather (11) ADDED: Correct, though the collision is more a steady push than a "crash". The Himalayas are still forming, with the up-lift slightly faster than the erosion, as India is still colliding with the Asian continental plate.
the plates might crash together causing the water above them to jolt, which can cause tsunamis.
The oceanic crust (the denser crust) is subducted under the lighter crust which basically means that it goes under the upper crust as they meet so they don't crash into each other like at a collision zone.
Techtonic plate movement forms land masses by three different movements or boundaries: 1. tranform boundaries- when plates slide BY one another 2. divergent boundaries- when plates slide APART fom one another 3.convergent boundaries- when plates slide TOWARDS one another Convergent boundaries can form a continental collision, when "plates crash or crunch together" forming a mountain range (over millions of years). a convergent boundary can also make an ocean trench when one plate slides under the other.
Virtually all of the world's volcanoes are located at the boundaries between tectonic plates. It is most common to find volcanoes where an oceanic plate collides with a continental plate. It is the boundary between the Pacific Plate and the continental plates around it that is called the "ring of fire" because so many volcanoes are formed at this boundary. In the collision the denser oceanic plate will be forced underneath of the continental plate. This is called 'subduction', and it usually occurs in destructive plate boundaries. Volcanoes are then formed, when the oceanic plate melts and the molten rock rises, being squeezed up by the forces of the mass above.
The plates are either moving past each other (transform boundary), toward each other (convergent boundary) or away from each other (divergent boundary). In some cases when there is a convergent boundary, one plate will be subducted under the other plate. During this process and the process occurring at a transform boundary, the plates don't slide easily past each other because they are jagged. The plates can get locked. Stress continues to build. Eventually, the stress becomes so great that the plates "pop" free. When that happens, there is a tremendous amount of energy released in the form of an earthquake.
Mountains form at (convergent and divergent) plate boundaries. Two plates can crash together and bend upward, forming a mountain, or lava can harden into rack and build up volcanoes which are mountains.
At a constructive plate boundary two plates move apart. As they move apart the magma from the magma chamber flows up to fill the gap. This causes a volcano. However, as the magma can escape easily it flows down the volcano with only a little bit of force. So it has a gentle erupt.