Volcanic eruptions are often, although by no means always, associated with a profuse output of fine pyroclastic material, tephra. While residence time in the atmosphere of the very finest of these particles can be substantial, the deposition of the bulk
Other measures assessing specific kinds of social media activity were also correlated with a positive change in the number of shootings after their experience with focused deterrence began, though none reached statistical significance: engagement in online feuds (r = 0.35), threats to rival gangs (r...