What is it called when one plate is pulled beneath another?
Convergent boundaries — where crust is destroyed as one plate dives under another.
What is it called when plates slide by each other?
When oceanic or continental plates slide past each other in opposite directions, or move in the same direction but at different speeds, a transform fault boundary is formed. No new crust is created or subducted, and no volcanoes form, but earthquakes occur along the fault.
What is a subducting plate?
When tectonic plates converge, one plate slides beneath the other plate, or subducts, descending into the Earth's mantle at rates of 2-8 centimeters (1–3 inches) per year. See Earthword – Subduction.
What is the definition of subduction erosion?
Definition. Subduction erosion defines a process in a subduction zone where material of the overriding upper plate is scraped off from its bottom by the downgoing lower plate.
What is the process of subduction?
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle.
What happens when two plates slide apart?
A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates.
What is another word for subduction?
•Other relevant words: (noun) retrench, detract.
Why the process of subduction occurs?
Subduction occurs when two plates collide at a convergent boundary, and one plate is driven beneath the other, back into the Earth's interior. Not all convergence leads to subduction. Continental rocks are too buoyant to be forced downward, so when continents collide, they crumple but stay at the surface.
What is subduction in geography?
The process by which one crustal plate descends beneath another one. When two plates collide, the denser one “subducts” or goes beneath the less dense plate. See also Subduction Zone. After "Earth, An Introduction to Physical Geography"
What is subduction erosion quizlet?
Subduction Erosion. a process in subduction zones in which sediment and rock are scraped off the bottom of the overriding plate and transported into the mantle. Deep-Ocean Basin.
What is a subduction simple definition?
Definition of subduction : the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another.
What process occurs in divergent plate boundary?
Divergent Plate Boundary – Oceanic When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere, producing a mid-ocean ridge. Extensional forces stretch the lithosphere and produce a deep fissure.
What does plate subduction mean?
Definition of subduction : the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another.
How does hydrothermal metamorphism alter saltwater and the basaltic rocks that make up the seafloor?
How does hydrothermal metamorphism alter saltwater and the basaltic rocks that make up the seafloor? Hydrothermal metamorphism causes the minerals olivine and pyroxene in basalt to form new minerals, such as chlorite and serpentine.
What is subduction of plates mean?
noun. an act or instance of subducting; subtraction or withdrawal. Geology. the process by which collision of the earth's crustal plates results in one plate's being drawn down or overridden by another, localized along the juncture (subduction zone ) of two plates.
What process occurs at a convergent boundary?
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common.
What does plate boundary show the sliding of two plates?
A transform plate boundary occurs when two plates slide past each other, horizontally. A well-known transform plate boundary is the San Andreas Fault, which is responsible for many of California's earthquakes. A single tectonic plate can have multiple types of plate boundaries with the other plates that surround it.
What is word subduction?
Definition of subduction : the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another.
What type of metamorphism involves mechanical deformation like shearing and grinding that takes place in fault zone?
Cataclastic metamorphism occurs as a result of mechanical deformation, like when two bodies of rock slide past one another along a fault zone. Heat is generated by the friction of sliding along such a shear zone, and the rocks tend to be mechanically deformed, being crushed and pulverized, due to the shearing.
What is seafloor metamorphism?
Ocean-floor metamorphism is a concept that has arisen from recent studies of present oceanic ridges and fracture zones where new crust is being generated, altered, and deformed.
What is a subduction process?
Subduction occurs when two plates collide at a convergent boundary, and one plate is driven beneath the other, back into the Earth's interior. Not all convergence leads to subduction. Continental rocks are too buoyant to be forced downward, so when continents collide, they crumple but stay at the surface.
What is continental convergence?
A continental-continental convergent boundary describes the collision of two tectonic plates composed of continental lithosphere. Just like an oceanic-oceanic convergent boundary, this type of boundary involves the compression of the same type of lithosphere.
At which plate boundary is one lithospheric plate sliding under another?
-ocean convergent boundary At an ocean-ocean convergent boundary, one of the plates (oceanic crust and lithospheric mantle) is pushed, or subducted, under the other. Often it is the older and colder plate that is denser and subducts beneath the younger and hotter plate. There is commonly an ocean trench along the boundary.
What is subduction in plate tectonics?
When tectonic plates converge, one plate slides beneath the other plate, or subducts, descending into the Earth's mantle at rates of 2-8 centimeters (1–3 inches) per year.
What are the metamorphic processes?
The metamorphism comprises recrystallization, metamorphic crystallization, deformation, fragmentation, and alternation.
What type of metamorphism would occur at a plate boundary where two continents are colliding?
Regional metamorphism refers to large-scale metamorphism, such as what happens to continental crust along convergent tectonic margins (where plates collide). The collisions result in the formation of long mountain ranges, like those along the western coast of North America.
Which is a metamorphic process?
Metamorphism is a process that changes preexisting rocks into new forms because of increases in temperature, pressure, and chemically active fluids. Metamorphism may affect igneous, sedimentary, or other metamorphic rocks.
What is the process of regional metamorphism?
Regional metamorphism is a type of metamorphism where rock minerals and texture are changed by heat and pressure over a wide area or region. Contact and regional metamorphism differ in both the area and pressure involved. With contact metamorphism we see rocks change, mainly due to heat in a relatively small region.
What is the process of convergent plate boundary?
A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. The subduction zone can be defined by a plane where many earthquakes occur, called the Wadati–Benioff zone.
What is convergent boundary?
When two plates come together, it is known as a convergent boundary. The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench.