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Which of the following concept of convection is correct? *
A. Convection occurs when heat is transferred through a gas or liquid by the hotter material moving into a cooler area.
B. Convection occurs when cold is transferred through a gas or liquid by the hotter material moving into a cooler area.
C. Convection occurs when heat is transferred through a gas or liquid by the cooler material moving into a hotter area.
D.Convection occurs when heat is transferred through a gas or liquid by the hot material moving into a hotter area.​