$3.(25)($a$)(10)$ The figure on the left is an SEM image of dust from World trade Center

collapse. After acquisition of this sample describe what detailed experiments you would

undertake to find the composition of the different components

$($b$)(5)$What are the sizes of the fibers and the particulates?

$($c$)(10)$Also observed are spheroid like structure $($figure on right$).$ The accompanied EDS

spectra for the spheroids in shown. Based on these data what is the size of the spheraids

and what is its possible composition?