  An amoeba is the image of a subvariety of an algebraic torus under the
logarithmic moment map. We consider some qualitative aspects of amoebas,
establishing some results and posing problems for further study. These problems
include determining the dimension of an amoeba, describing an amoeba as a
semi-algebraic set, and identifying varieties whose amoebas are a finite
intersection of amoebas of hypersurfaces. We show that an amoeba that is not of
full dimension is not such a finite intersection if its variety is
nondegenerate and we describe amoebas of lines as explicit semi-algebraic sets.
