Within the sun's convection zone, how do fluids change as they move from the inner to the outer portions?

Within the sun's convection zone, how do fluids change as they move from the inner to the outer portions?

• A. They become more dense at the outer portion of the convection currents.
• B. They become less dense at the outer portion.
• C. They become more dense at the inner portion.
• D. They become less dense at the inner portion.

Answer: (A)

In convection, movement is driven by density differences: hot, less dense fluid rises, and cooler, denser fluid sinks. In the Sun’s convection zone, the fluid near the inner boundary is hotter and lighter, so it rises outward. As it moves toward the outer regions, it cools and expands, which increases its density. By the time it reaches the outer portion of the convection currents, the fluid is denser than it was at the inner edge. So the correct idea is that fluids become more dense as they move outward. The other descriptions would not sustain the rising motion observed in solar convection, since cooler, denser material tends to sink rather than rise.

In convection, movement is driven by density differences: hot, less dense fluid rises, and cooler, denser fluid sinks. In the Sun’s convection zone, the fluid near the inner boundary is hotter and lighter, so it rises outward. As it moves toward the outer regions, it cools and expands, which increases its density. By the time it reaches the outer portion of the convection currents, the fluid is denser than it was at the inner edge. So the correct idea is that fluids become more dense as they move outward. The other descriptions would not sustain the rising motion observed in solar convection, since cooler, denser material tends to sink rather than rise.