A wide variety of names are commonly used for petrified wood. Fossilized wood is a general term for wood that has been petrified or preserved by other methods of fossilization. Opalized wood is petrified wood that has been replaced by opal, an amorphous form of silica.
DHS redirects here. For other uses, see DHS (disambiguation). The United States Department of Homeland Security (DHS) is a cabinet department of the United States federal government with responsibilities in public security, roughly comparable to the interior or home ministries of other countries.
Following this construct, DOD is the Lead Federal Agency for the homeland defense mission and has a supporting role in homeland security through its missions of civil support (also called Military Assistance to Civil Authorities [MACA] and Defense Support to Civil Authorities [DSCA]) and emergency preparedness.