A _____ is a mixture of gas and pyroclastic debris that is so dense that it hugs the ground as it flows rapidly into low areas.
A) silica flow
B) lava flow
C) pyroclastic flow
D) change in viscosity
E) pahoehoe lava flow

Question

Quizplus · Accepted Answer

A pyroclastic flow is a dense mixture of gas and pyroclastic debris that is so heavy that it flows rapidly along the ground, hugging the terrain as it travels. This type of flow is extremely dangerous and can reach speeds of up to 700 km/h (430 mph), making it difficult to avoid. It is formed when volcanic gases and particles are ejected from a volcano during an explosive eruption and then mix with the surrounding air. The density and weight of the mixture cause it to flow rapidly along the ground, down valleys and slopes, and into low areas, often burying everything in its path.

A _____ Is a Mixture of Gas and Pyroclastic Debris