What type of volcano is characterized by steep slopes and eruptions of viscous lava and ash?

The type of volcano characterized by steep slopes and eruptions of viscous lava and ash is a composite volcano. Composite volcanoes, also known as stratovolcanoes, are formed from alternating layers of lava flows and volcanic ash. This layering contributes to their steep profiles. The lava that erupts from these volcanoes is typically more viscous, which means it does not flow easily. This characteristic leads to explosive eruptions that can project ash and pyroclastic materials into the atmosphere, further contributing to the steep slopes associated with these structures.

In contrast, cinder cone volcanoes tend to have more gentle slopes and are primarily built from small fragments of solidified lava ejected from a single vent. Shield volcanoes have broad, gently sloping surfaces and are primarily built from low-viscosity lava that flows over long distances, resulting in a less steep profile. Lava domes form from the slow extrusion of viscous lava, creating dome-shaped piles that are often steep but typically much smaller than composite volcanoes and are not associated with explosive eruptions like those found in composite structures.