Question

what do we call heat transfer by the movement of currents in fluids? convection conduction radiation

Explanation:

Convection is the heat transfer mechanism in fluids (liquids and gases) where heat is moved by the bulk movement of the fluid itself. This involves the formation of currents as warmer, less - dense fluid rises and cooler, denser fluid sinks. Conduction is heat transfer through direct molecular collisions (usually in solids), and radiation is heat transfer via electromagnetic waves (does not require a medium).

Answer:

Convection