Checks and balances, evenly distributed the power amongst the branches of government and disallowing one to have more power than another.
Answer:
The mountains impede trade because they are too high and vast to easily transport
Longitude measures the number of degrees EAST or WEST of the Prime Meridian which runs through Greenwich, England.
Lines of latitude run east-west around the globe and are used to measure distances NORTH and SOUTH of the equator.
Controlled by supply and demand
