Question

How is a convection current created? Select all that apply.

A fluid is warmed, its volume decreases, but its mass remains the same, thus its density decreases, causing it to rise.
As the cooler fluid rises and the warmer fluid sinks, a convection current is set up.
Cooler fluid rises because its density is smaller than the warmed fluid's density.
A fluid is warmed, its volume increases, but its mass remains the same, thus its density decreases, causing it to rise.
Cooler fluid sinks because its density is larger than the warmed fluid's density.
As the warmer fluid rises and the cooler fluid sinks, a convection current is set up.

Answer 1

Correct choices: 4, 5, and 6.

Brief explanation: Heating a fluid increases its volume (mass stays the same), so its density (mass/volume) decreases and the warmer fluid rises. Cooler fluid is denser, so it sinks. The rising warm fluid and sinking cool fluid produce a convection current.