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Please provide an academic definition, with an in-text citation, of the concept

Please provide an academic definition, with an in-text citation, of the concept of a Presidential Declaration of Disaster.
Briefly explain the Four Phases of Emergency Management.
Finally, this week, please provide some elaboration upon the concept of Normative Theories of Disaster.
Please include in-text citations, as well as a reference list, both in alignment with APA 6th edition citation form and style in your main post. You may use the textbook as a source citation or a journal article, retrieved from the University Library Databases, as a source citation as well.