Which type of volcano is primarily characterized by broad, gentle slopes?

The type of volcano primarily characterized by broad, gentle slopes is the shield volcano. These volcanoes are formed by the eruption of low-viscosity basaltic lava, which can flow over great distances. As a result, the eruptions contribute to the gradual buildup of the volcano in a broad, shield-like shape, resembling a warrior's shield laid on the ground. This gentle slope is a distinctive feature, distinguishing shield volcanoes from other types.

In contrast, cinder cone volcanoes typically have steep slopes created from the accumulation of volcanic debris, including ash and cinders, which are ejected during explosive eruptions. Composite volcanoes, or stratovolcanoes, feature a much more complex structure with steeper slopes formed from alternating layers of lava and ash, leading to a more conical shape. Lava domes are also characterized by steep sides, being formed from the slow extrusion of viscous lava that piles up near the vent.

The broad, gentle slopes of shield volcanoes make them unique among the different types of volcanic formations.