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1. New sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches.

2. The area is a subduction zone. Magma from underground comes up and destroys that crust. That crust is then recycled and the magma cools and hardens. That creates new land, that creates the trenches. Seafloor spreading is in the ocean and happens with convection currents. That is the relationship between.

3. As new seafloor is formed at mid-ocean ridges, the old seafloor is pushed down into trenches at subduction zones.

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What happens is that the area is a subduction zone. Magma from underground comes up and destroys that crust. That crust is then recycled and the magma cools and hardens. That creates new land. So that creates the trenches. Seafloor spreading is in the ocean and happens with convection currents. that is the relationship between.

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Q: Explain the relationship between trenches and seafloor spreading?
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