The two centuries of Roman history beginning with the rule of Augustus is seen as a golden age in part because of major advances in
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navigation
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architecture
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medicine
OD. philosophy

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.