Question

Oceanic lithosphere is destroyed at?

Answer 1

ANSWER:

Oceanic lithosphere is destroyed when it is subducted at a focalized plate boundary and constrained into the mantle where it dissolves.

EXPLANATION:

• Oceanic lithosphere is the topmost layer of the oceanic part of a tectonic plate.

• It is made of two crust, the upper crust of oceanic made out of "pillow lavas", and the lower oceanic crust, made out of gabbro, troctolite, and ultramafic cumulates.  

• The crust overlies the uppermost and cemented layer of the mantle.  

Answer 2

The two most obvious ones are on the far right, and near the far left. Oceanic lithosphere is descending into the earth's mantle at these places, and being destroyed. ... At convergent boundaries oceanic lithosphere is always destroyed by descending into a subduction zone