Question

1)why can the sun's heat not reach the earth by conduction and convection
2)which is the most important in solids, liquids, gases and empty space (or vacuum)
3)explain why it is difficult to hold a stainless steel tumbler containing very hot tea in the hand but thermocol Cup containing the same hot tea can be hald easily

Answer 1

I know the third answer it is because thermocol is not a conductor of heat