Convection occurs when thermal energy is transferred by the movement of

Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.

they should be similar or the same

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !