Which everyday observation shows that hot air rises and cool air sinks creating circulation?
A
Boiling water forming convection currents
B
Ice melting in sunlight
C
Metal expanding when heated
D
Sound echoing in a hall
Correct Answer: Option A — Boiling water forming convection currents
Explanation:
Boiling water shows convection currents as hot less-dense water rises to the surface while cooler denser water sinks demonstrating natural thermal circulation.