the pax romana was: (a)200 years of stability . (b)an experiment in democracy . (c)a giant stadium, in which gladiators fought battles . (d)a deadly plague that killed more than 30% of the population of the roman empire.

A.) 200 years of stability

Explanation:

The Pax Romania (which is Latin for "Roman Peace") is roughly a 200-year-long period in Roman history which is identified with increased and sustained inner hegemonial peace and stability (all though it's not meaning without wars, expansion and revolts.)

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australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.