In the ancient world, why did civilizations flourish around great river valleys? A) River valleys protected citizens from natural disasters.
B) River valleys provided an ideal environment for agriculture.
C) River valleys sheltered citizens from harsh weather.
D) River valleys contained vast mineral resources.

Where did zebulon pike spend most of his time exploring?

When there are advances in technology, such as the personal computer, how might business productivity change? a) productivity is separate from technological advances so there is no impact. the new technology can replace outdated, less efficient, machinery. o) the businesses' products will no longer be demanded. d) manufactured items will be made elsewhere.

Select all the correct answers. what were two effects of the french revolution in france?