Final answer:
Strato-/composite-cone volcanoes are made mostly of andesitic lavas and pyroclastic material.
Step-by-step explanation:
The correct answer is strato-/composite-cone volcanoes. Strato- or composite-cone volcanoes are characterized by their steep slopes and large size. They are made up of alternating layers of andesitic lavas and pyroclastic materials, such as ash, cinders, and rocks. Examples of strato-/composite-cone volcanoes include Mount St. Helens in the United States and Mount Fuji in Japan.
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