Answer:
lava surges up to create new crust. usually makes new ocean floor in the open ocean.
Explanation:
Answer:
as tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. This rock (basalt) becomes a new part of Earth's crust. Mid-Ocean Ridges. Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor.
Explanation:
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