Which earthquake severity scale varies from locality to locality for a single earthquake?

What is the general rule about surface currents? cold water flows along the ocean floor towards the equator. the east coasts of continents have cold surface currents, and the west coasts of continents have warm surface currents. seasonal and constant offshore winds create significant upwelling along the west coasts of south and north america and africa. the west coasts of continents have cold surface currents, and the east coasts of continents have warm surface currents.

As water is cooled from 4 c to 0 c its density

All of the following occurred due to the invention of the railroad except