Answer :
new oceanic crust is continuously being created at mid-ocean ridges. lithospere is created in the gaps of upwelling magma from the mantle.
At mid-ocean ridges, new oceanic crust is constantly being formed. In the gaps of upwelling magma from the mantle, lithospere forms.
What is oceanic crust?
The uppermost layer of the oceanic portion of the tectonic plates is known as the oceanic crust.
It is made up of pillow lavas and a complex in the upper oceanic crust troctolite, gabbro , ultramafic cumulates in the lower oceanic crust.
Thus, it is mid-ocean ridges.
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