A deep ocean trench with parts A through D labeled. A: water and land meet. B: lithosphere layer below the ocean goes below land
. C: volcano and mountains. D: lithosphere layer below land stops at lithosphere layer below ocean. Look at the diagram and then answer the following questions. The process shown in this diagram is. Letter A in the diagram indicates a. The oldest area in the diagram is.
It is the part of the ocean where new crusts are formed.
The place marked with A on the map is the place in the ocean where the new crust is formed. That is a place where there's a divergent plate boundary, or rather a place where the tectonic plates are moving away from one another. The gap and cracks left between them are easy target for the magma from the mantle to penetrate towards the surface. As the magma reaches the ocean floor it starts to cool off very quickly, creating new crust, and slowly making a very large underwater mountain range known as mid-ocean ridge.
