Answer
a. The term that best describes this type of flow is a pyroclastic flow. Pyroclastic flows are fast-moving currents of hot gas, ash, and volcanic materials that can travel down the flanks of a volcano at high speeds, typically generated by explosive volcanic eruptions. They can be extremely destructive and pose significant risks to life and property.
b. The domed structure composed of broken lava blocks near the summit of the volcano is called a volcanic dome or a lava dome. Lava domes form when highly viscous lava is extruded from a volcano and accumulates near the vent, building up a dome-shaped mass of solidified lava. These domes are often characterized by fragmented and blocky textures due to the slow extrusion and cooling of the lava.
Work Step by Step
Refer to the above answer.
