Science Olympiad Dynamic Planet Practice Test

What type of volcano is characterized by eruptions of small pieces of scoria and pyroclastics?

1. Cinder cones

2. Shield volcanoes

3. Stratovolcanoes

4. Super volcanoes

The correct answer is: Cinder cones

Cinder cone volcanoes are defined by their construction primarily from explosive eruptions that eject small fragments of lava, known as scoria, along with various pyroclastic materials. These types of eruptions occur when gas-rich magma ascends to the surface, causing it to fragment into small, solidified pieces that fall back around the vent, creating a steep, conical hill or mound. The small size of the erupted material and the explosive nature of the eruptions contribute to the distinctive conical shape of cinder cone volcanoes. They are often characterized by a single vent and have a relatively short lifespan compared to other volcano types, typically forming quickly during a single eruption or a series of closely timed eruptions. In contrast, shield volcanoes are formed primarily from the eruption of low-viscosity basaltic lava, leading to broad, gentle slopes. Stratovolcanoes, or composite volcanoes, exhibit more complex eruptions that can involve both lava flow and explosive activity, resulting in their layered structure. Supervolcanoes are large volcanic systems with the potential for extraordinarily explosive eruptions, involving massive volumes of pyroclastics, but they differ significantly from cinder cones in scale and eruption style. Therefore, cinder cones specifically align with