Which type of volcano is known for having very steep sides and explosive eruptions?

The type of volcano characterized by very steep sides and explosive eruptions is the composite volcano. These volcanoes, also known as stratovolcanoes, are formed from a mixture of lava flows, ash, and other volcanic debris. The composition of the magma in composite volcanoes is typically viscous, meaning it doesn't flow easily. This high viscosity causes gas to trap within the magma, leading to intense pressure buildup. When the pressure is released, it results in violent eruptions that can eject ash, volcanic rocks, and lava explosively.

The steep slopes of composite volcanoes are a result of the alternating layers of solidified lava flows and volcanic ash. The angles created by these layers contribute to their towering appearance, making them distinct from other types of volcanoes, such as shield volcanoes, which have gentle, broad slopes formed by the low-viscosity lava that flows easily.

In contrast, shield volcanoes have a wide and gently sloping profile due to the fluidity of their lava. Dome volcanoes are formed from more viscous lava that piles up near the vent, leading to a rounded shape rather than steep slopes. Ash-cinder volcanoes, while also explosive, tend to be smaller and produce less volume than composite volcanoes.