It is called subduction.
Subduction
subduction
subduction
A deep ocean subduction trench
This is known as a trench in a subduction zone.
Close by the Tonga Island on the ocean floor lies the Tonga trench, which is a convergent boundary. At the Tonga trench the Pacific plate is subducting beneath the Australian-Indian plate, sending slabs of the Pacific plate into the mantle.
The trenches are evidence that one of the colliding plates is moving beneath the other. As the two plates move together, one gets pushed below the other. The place where this sinking/bucking occurs creates a deep trench. The deepest of which is Marianas trench about 7 miles deep.
deep ocean trench.
This process is called subduction.
subduction is the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
The pacific oceanic plate is sinking beneath conential plate
Where one plate is pushed downward beneath another plate into the underlying mantle when plates move towards each other..=)
A deep ocean subduction trench
When a piece of the ocean floor cracks, one side of the crack will sink beneath the other side. As it sinks, it pulls the rest of its plate with it. The sinking sea floor grinds against the other side of the crack and tears parts off. The result is a long, deep trench. This process is how the Mariana Trench formed.
A deep trench to the mantle
The Benioff Zone is formed when a piece of oceanic crust is being subducted into the mantle. This line of earthquakes follow the angle of the subducting plate as it slides beneath the continental crust.
This is known as a trench in a subduction zone.
Close by the Tonga Island on the ocean floor lies the Tonga trench, which is a convergent boundary. At the Tonga trench the Pacific plate is subducting beneath the Australian-Indian plate, sending slabs of the Pacific plate into the mantle.
The pacific oceanic plate is sinking beneath the continental plate to which Japan is attached in what is called a subduction zone. The oceanic plate is being destroyed.
When two oceanic plates or two plates both containing oceanic crust collide or converge, the convergent boundary will form a trench. The plate which has the higher density will plunge beneath the other plate forming a trench.