Question

Which of the following statements regarding the 'glowing avalanche' (pyroclastic flow) is incorrect?

1. The 'glowing avalanche' is considered the most dangerous type of volcanic eruption.
2. Its extreme heat and speed contribute to the danger of a pyroclastic flow.
3. Pyroclastic flows consist of a slow-moving mixture of volcanic gases and fragmented rock, making them relatively harmless.

• A. 3 മാത്രം
• B. 2, 3
• C. 1, 3
• D. 1, 2

Answer 1

Answer:

A. 3 മാത്രം

The 'glowing avalanche', scientifically known as a pyroclastic flow, is indeed considered the most dangerous type of volcanic eruption. It is not slow-moving or harmless; quite the opposite. Pyroclastic flows are fast-moving currents of hot gas and volcanic debris (tephra) that can reach temperatures of up to 1,000°C (1,830°F) and speeds exceeding 700 km/h (430 mph). They typically flow down the flanks of volcanoes, incinerating and burying everything in their path. Their immense speed, heat, and destructive power make escape nearly impossible, posing a significant threat to life and property in their vicinity. The eruptions of Mount Pelée in 1902 and Vesuvius in 79 AD, which destroyed Pompeii and Herculaneum, involved devastating pyroclastic flows.