a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved
the outer boundary of an artifact or a material layer constituting or resembling such a boundary
the extended two-dimensional outer boundary of a three-dimensional object
the outermost level of the land or sea
on the surface
excavation in the earth from which ores and minerals are extracted
explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel
get from the earth by excavation
