1. In the earliest moments of the Universe conditions of almost inconceivable ____ raged through the swelling cosmos; yet this great ____ managed to produce only the simplest of atoms.
A. tumult - cataclysm
B. tranquillity - upheaval
C. violence - complexity
D. turbulence - conglomeration
E. chaos - inertia
2. The assumption that chlorofluorocarbons would be ____ in the environment because they were chemically inert, was challenged by the demonstration of a potential threat to the ozone layer.
A. deleterious
B. innocuous
C. persistent
D. noxious
E. durable
3. The Rio Gila is part of a ____ of rivers and cultures as significant as the ____ of the Tigris and the Euphrates.
A. disparity - conjunction
B. intermingling - dichotomy
C. juxtaposition - divergence
D. conglomeration - diaspora
E. convergence - confluence