Choose a kind of childhood trauma and address; How common is it for children

 
Choose a kind of childhood trauma and address;
How common is it for children to experience this kind of trauma?
Are there specific effects that result from this kind of childhood trauma?
What kinds of behaviors do children who have undergone this kind of trauma demonstrate?
Give  at least one example of an intervention that is based on science and  has been used to address the issues found in children as a result of the  trauma. Briefly discuss the overall results of this intervention.
Natural disasters
Terrorism
Illness
Abuse
Divorce
Economic stress
Military family stress, PTSD