In the context of disaster notification, the is a scripted description of the disaster and consists of just enough information so that each response knows what port of the dr plan to implement.

In the context of disaster notification, the alert message is a scripted description of the disaster and consists of just enough information so that each response knows what port of the Dr plan to implement. These messages together with the warning messages are generated by the coastal control sensors, deep ocean stations or seismic centers. 

A,) cause a & b are equal & both gives 180°