Explanation:
Convection is defined as a process in which upon heating a fluid (liquid or gas) there occurs rising of hot (less dense) dense molecules and sinking of cold (more dense) molecules.
For example, when rice in a pot of water are moving then it means the convection current arises in water when radiator that emits warm air and draws in cool.
As a result, rice that has absorbed heat become light in weight and hence they will rise and cold (more dense) rise that have not absorbed heat yet will sink at the bottom.
Similarly, when a hot air balloon is rising and falling in the atmosphere then hot (less dense) gas molecules causes them to rise in the air whereas cold molecules (more dense) will cause it to fall in the atmosphere.
Therefore, we can conclude that out of the given options examples of convection currents are as follows.
