when you boil water to make pasta hot water from the bottom of the pan carries thermal energy to water molecules at the top the pan . This is an example of

Yes convection will always work faster and more efficiently.

Explanation:

When a gas or a liquid is heated, hot areas of the material flow and mix with the cool areas. ... Convection transfers heat over a distance faster than conduction. But ultimately conduction must transfer the heat from the gas to the other object, though molecular contact.