volatile

volatile: means a tending erupt into violence: explosive.
There was a volatile explosion in the classroom today.

succession: Also called ecological succession. Ecology. the progressive replacement of one community by another until a climax
in my own words:kindergarden i learned my abc's, in first grade i learned to put letters in spefic orders to form words, and put word in order to form sentences. In second grade i learned to put sentences in order to make paragraphs. In third grade i put paragraphs in order to make stories.