1. Molten rock flows onto the seafloor and hardens as it cools.
2. Hot, molten rock is forced upward toward the seafloor at a mid-ocean ridge
3. New seafloor moves away from the ridge, cools, becomes denser and sinks.
4. Molten rock pushes sideways in both directions as it rises, moving the mantle with it.
Directions: Complete the concept map using the terms in the list below.
mid-ocean ridges
volcanic islands major earthquakes
rift valleys
deep-sea trenches
volcanic mountains
Plate boundaries
include
include
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trans