What type of volcano has steep slopes primarily made up of pyroclastic material?

The type of volcano characterized by steep slopes predominantly made up of pyroclastic material is a cinder cone volcano. Cinder cone volcanoes are constructed from the accumulation of volcanic debris, primarily ash and small volcanic rocks (called cinders), ejected during explosive eruptions. This material typically falls back to the ground around the vent, creating the steep, conical shape that defines these volcanoes.

The steepness arises from the angular and loose nature of the cinders, making it difficult for them to settle flat and allowing for the formation of sharp slopes. In contrast, other types of volcanoes, like the composite volcano and stratovolcano, can also have slopes formed from a mixture of lava flows and pyroclastic material, resulting in a more complex structure. Shield volcanoes, on the other hand, are characterized by gentle slopes built primarily from the flow of low-viscosity basaltic lava, leading to their broad and wide shapes rather than steep elevations.

Cinder cone volcanoes stand out in their visual and structural characteristics, primarily due to their steep profiles and the type of materials they are constructed from, which directly influences their formation processes and eruption styles.