What type of volcano is formed from layers of lava from repeated nonexplosive eruptions, characterized by sloping sides?

The type of volcano formed from layers of lava that result from repeated nonexplosive eruptions, characterized by broad, gently sloping sides, is known as a shield volcano. These volcanoes are built primarily from low-viscosity basaltic lava that can flow over great distances, allowing for the formation of their wide bases and gently sloping profiles. The eruptions are typically nonexplosive, leading to the gradual accumulation of lava layers over time.

In contrast, the other options involve different geological features or eruption styles. Volcanic mountains can refer to a variety of volcano types and do not specifically describe the shape or eruption style. Cinder cone volcanoes are typically small, steep-sided, and formed from the eruption of small fragments of lava that solidify as they fall to the ground. Dome mountains are generally formed from more viscous lava that piles up near the vent, creating a steeper and more dome-like shape, rather than the broad slopes characteristic of shield volcanoes.