Question

In which of the following situations would convection currents most likely occur?

within a block of iron that has been placed in a freezer

within the water in a lake as ice forms on the top

within a spoon that has been placed into warm soup

within a plastic box from which all the air has been removed

Answer 1

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatra.html#c3

Please read that! And that site has tons of useful information.

There is one big thing about convection. It is heat transfer by motion of a \(\sf{fluid}\).

The convection currents are described well in that link.