the area with low pressure will be more dense in the area with high pressure will be less dense
Well the big cities were by the river back then for importing goods by the boat
Bedrock structure is primarily responsible for landscape differences.
Bedrock lies beneath the surface materials such as soil,
gravel, sand and other sediments. It is a deposit of hard, consolidated,
tightly-bound solid rock. It is the parent material for unconsolidated material
and soil above thus influencing landscapes.
Formula for speed of light is:

Where:
c=speed of light = 300000 km/s
d=distance
t =time
Rearranging formula for t and calculating: