A pyroclastic flow is a fast-moving current of hot gas and volcanic matter that flows down the slopes of a volcano during an explosive eruption. These flows can reach speeds of up to 700 km/h (about 435 mph) and can be extremely dangerous due to their high temperatures, which can exceed 1,000 °C (1,832 °F). Pyroclastic flows are composed of a mixture of ash, pumice, and volcanic gases. They can travel over land and water, destroying everything in their path. Understanding pyroclastic flows is crucial for assessing the risks associated with volcanic eruptions and protecting nearby communities.