While the terms are distinct, the Vesuvian type (or Plinian) is often associated with the Pelean type in older geographical classifications due to their shared extreme explosiveness. Both involve high-viscosity magma and massive ash columns. However, modern geology usually treats them separately, with Pelean emphasizing lateral blasts and Vesuvian emphasizing high-reaching vertical columns that spread ash over vast, distant regions. ANSWER: (D) Vesuvian type
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In many historical geography contexts, the Vesuvian type is categorized alongside the Pelean type because both represent the most violent end of the volcanic spectrum. Named after the 79 AD eruption of Mount Vesuvius, these eruptions are characterized by sustained, high-altitude eruption columns that spread ash across thousands of square miles. Both types rely on gas-rich, high-viscosity magma. While the Pelean type is famous for its horizontal pyroclastic flows, the Vesuvian type is noted for its vertical power. They are often grouped together when discussing the mechanics of silica-rich, explosive eruptions that drastically alter global climates and landscapes.