9. which fragment could become a complete sentence by adding only a subject? the total surface area of the desert buckled and cracked a long period in which the volcano was dormant near the edge of the cliff

Near the edge of the cliff

Afirefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires that threaten life, property and the environment as well as to rescue people and animals from dangerous situations.  just cut some parts to make them shorter and add some of your facts or what describes them most. or what they are supposed to do.