Answer
1. c. convection
2. b. When it is very cold
Explanation
Water like any other liquid transfer heat energy through convection.
When a pot of water is put on a stove, the water at the top gets hot primarily by convection.
A supperconductor is a material that can conduct electric current with no resistance at all.
The supperconductivity can be achieved under cooled temperatures.
Certain materials can become superconductors under what conditions? When it is very cold
