Calculating the formula mass of sodium hydroxide

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

  the mississippians were considered to be  horticulturalists, which means they were

What term describes technology that operates on an atomic level