[crawrey]

Dangerous does not necessarily mean fatal. The posed question specifically states environment, and the bed as an environment is typically a flat, soft, blunt, rectangular prism.

Whereas volcanoes, and more specifically, active volcanoes can be unpredicable and spurt out hot lava and ash.

The question is worded fine and your attempt to poke holes into this is invalid.

Even if a question is worded well, it can always be interpreted incorrectly. The question should not be blamed for a person's inability to process information.