Sentence:  Along Wappinger Creek in Dutchess County , past the white church at Fishkill , past Verplanck 's Point on the east bank of the Hudson , to the white salt crusted roads of the Long Island Rockaways there was a watching and an activity of preparing for something <WSD>explosive</WSD> to happen . 
Meaning of the word marked with <WSD> tags:  liable to lead to sudden change or violence