Question

which describes the motion in a convection current?
horizontal motion only
vertical motion only
linear motion
circular motion

Explanation:

Convection currents involve the movement of fluid (liquid or gas) due to differences in temperature and density. The fluid near a heat source gets heated, becomes less dense, and rises (vertical motion). The cooler, denser fluid then sinks (also vertical motion). This continuous cycle of rising and sinking creates a circular - like pattern. But the fundamental motion that drives the convection current is the vertical motion (rising and falling of the fluid). While the overall pattern might seem circular, the key motion that initiates and is a major part of the convection process is the vertical motion.

Answer:

vertical motion only