Documents 1 Earths History. 2 Planet Earth is approximately 4.5 X 10 9 years old –Rocks of the crust provide...

Slide 11 Earths History Slide 2 2 Planet Earth is approximately 4.5 X 10 9 years old –Rocks of the crust provide clues to Earths past By analyzing these clues we can infer…

Documents Evacuate or shelter in place? Life safety? Cause of casualties following ash fall Roof collapse of.....

Slide 1 Slide 2 Evacuate or shelter in place? Life safety? Cause of casualties following ash fall Roof collapse of structures Falls during clean up operations Public Health…