Playful rephrasings for a 7-year-old: Hot-air balloons rise when the air inside is heated and fall when it cools (4 fun versions)

Quick, simple steps to understand first:

1. Warm air inside the balloon makes the balloon lighter, so it rises.
2. When the air cools, the balloon gets heavier and comes back down.

Four playful rephrasings:

1. "When the air in the big balloon gets warm and toasty, the balloon floats up like its going on a sky adventure; when the air cools, it drifts back down for a nap."
2. "Give the balloon warm air and it goes 'Up, up!' like its climbing a ladder; when the air gets cold it says 'Time to rest' and gently comes down."
3. "Warm air is like a cozy puff that lifts the balloon into the clouds; cold air lets it snuggle down toward the ground."
4. "Blow hot air inside and the balloon grows invisible wings to fly up; when the air cools the wings fold and it floats back down."

Pick the one you like best — they all mean the same simple idea: warm air makes balloons go up, cold air makes them go down.