Answer: Usually on a map, solid lines represent boundaries between nations, or if it is a map of the states, it would represent the borders of the states.
Explanation:
Prehistory.
Because people did not have any form of writing or written language nothing in that time could be recorded or documented.
Trade was a lot more difficult and complicated because every currency was worth something different.
1 as 0.7306 rounds upwards (it is greater that half of 1)
Well hydro= water so it would be the water cycle.