picture a shows subduction and formation of the ocean trench. they are formed at convergent boundaries.
picture b shows mountain ranges and high plateau formed at convergent boundaries. when two continental (land) plates converge, they crumple up and compress, forming complex mountain ranges and very high plateaus.
picture c shows seafloor spreading. a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. as tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
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Answer:
picture a shows subduction and formation of the ocean trench. they are formed at convergent boundaries.
picture b shows mountain ranges and high plateau formed at convergent boundaries. when two continental (land) plates converge, they crumple up and compress, forming complex mountain ranges and very high plateaus.
picture c shows seafloor spreading. a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. as tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.