Final answer:
A pyroclastic flow is an explosive volcanic event that can travel at high speeds and cause significant destruction. It is a fast-moving avalanche of hot gas, ash, and volcanic fragments that can topple buildings and lift cars.
Step-by-step explanation:
The explosive volcanic event described in the question is known as a pyroclastic flow. These flows are fast-moving avalanches of hot gas, ash, and volcanic fragments that can travel at speeds greater than 470 km/h (292 mph). They are extremely destructive and can topple buildings, lift cars, and completely devastate everything in their path.
Pyroclastic flows occur during volcanic eruptions when the explosive eruption column collapses and sends a dense cloud of hot material cascading down the slopes of the volcano. These flows can cause widespread destruction and loss of life.
One famous example of a pyroclastic flow is the eruption of Mount Vesuvius in 79 AD, which destroyed the cities of Pompeii and Herculaneum.