Question

why do convection currents form in the atmosphere?
a because gravity pulls air downward evenly
b because the sun heats earth’s surface unevenly, causing warm air to rise and cool air to sink
c because the earth’s core heats the air directly
d because the moon blocks the sun’s energy

Explanation:

Convection currents in the atmosphere form because the Sun heats Earth's surface unevenly. This uneven heating causes warm air to rise (as it is less dense) and cool air to sink (as it is more dense), creating a cycle of air movement. Option A is incorrect as gravity pulling air downward evenly doesn't explain convection. Option C is wrong because the Earth's core heating the air directly is not the main cause of atmospheric convection (the Sun is the primary source). Option D is incorrect as the Moon blocking the Sun's energy is not a factor in the formation of regular atmospheric convection currents (the Moon's shadow during an eclipse is a rare event and not a general cause).

Answer:

B. Because the Sun heats Earth's surface unevenly, causing warm air to rise and cool air to sink