Answer
The type of plate boundary that generates the greatest quantity of magma is the divergent plate boundary. At divergent boundaries, tectonic plates move away from each other, creating a gap or rift between them. This rift allows hot mantle material to rise and fill the gap, leading to decompression melting. The melted rock, or magma, then rises to the surface, resulting in volcanic activity. The continuous separation of plates at divergent boundaries allows for a sustained supply of magma, leading to a large volume of volcanic eruptions. Examples of divergent plate boundaries with extensive volcanic activity include the Mid-Atlantic Ridge and the East African Rift.
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