What Flowing cloud of tephra and lava mixed with hot suffocating gases?

The flowing cloud of tephra and lava mixed with hot suffocating gases is known as a pyroclastic flow. These hazardous phenomena occur during volcanic eruptions when volcanic materials are expelled violently and rapidly descend down the slopes of a volcano. Pyroclastic flows are extremely dangerous due to their high temperatures, speed, and density, capable of obliterating everything in their path. They pose significant risks to life and property in surrounding areas during an eruption.