Basically add up all the sides... And that's the perimeter don't forget to add your units
If you are asking which continent has the largest population then it would be Asia with 4.46 Billion people accounting for more then 62% of earths human population
Geothermal heat- to provide energy for process like subduction, melting and metamorphism (to drive plate tectonics)
solar energy- for processes like erosion, weathering and transport
