Read the dictionary definition of eruption. All definitions for this word.
1. the emergence of a tooth as it breaks through the gum
2. a sudden very loud noise
3. a sudden violent spontaneous occurrence (usually of some undesirable condition)
1. the outbreak of hostilities
4. the sudden occurrence of a violent discharge of steam and volcanic material
5. (of volcanos) pouring out fumes or lava (or a deposit so formed)
6. symptom consisting of a breaking out and becoming visible