Final answer:
Site characterization is the part of the response phase that contains aerial photos, descriptions of buildings, and maps of the area.
Step-by-step explanation:
The part of the response phase that contains aerial photos, descriptions of buildings, and maps of the area is site characterization. Site characterization involves gathering detailed information about the location or area in order to effectively respond to an emergency. In the case of emergencies, such as natural disasters or hazardous material incidents, site characterization provides critical data for emergency responders to assess the situation and make informed decisions. Aerial photos, descriptions of buildings, and maps of the area are important components of site characterization.