How hot air balloons use convectional currents?

Is there any diffference between the bloodpressure in the major arteries of neck and the legs in the space? Are signs of the Zodiac also constellations? How do clocks wake us up? What cards activate Dark World Monster effects in the expansions Raging Battle Ancient Prophecy Stardust Overdrive Absolute Powerforce The Shining Darkness and the 10 Duelist packs? What is the legend about the big dipper? What does a red shift in light from distant celestial objects indicate to a scientist on Earth? Moon rocks indicate there is no what on the moon? What is average temperature on Mount Everest? What is the name of Saturn's moons? What is the mood in the city is so big and the sky is low the clouds are mean? How would your weight and mass change if you were floating freely in space? What are the coordinates of the constellation Phoenix? Is a basement a habitable space? How can visibility tell you about weather? Which star is smaller in size Procyon B or Mira? Would a candle tied to a paperclip work as a Cartesian diver? What country was the first to land on the moon? Does the goddess Athena have freckles? Where is the ant nebula? What is the brightest star in canis minor?

How hot air balloons use convectional currents?