Question

sample response: convection is the method of thermal energy that occurs in hot air balloons. thermal energy is transferred when the air above the flame becomes warm and less dense, and rises. cool, dense air sinks and takes the place of the warm air that rises. the cool air is warmed by the flame, becomes less dense, and rises. this cycle continuously warms up the air in the balloon. what did you include in your response? check all that apply. ☐ convection occurs in hot air balloons. ☐ air above the flame warms, becomes more dense, and rises. ☐ cool air in the balloon sinks and takes the place of the warm air that rises, and is warmed by the flame. ☐ the cycle continuously warms up the air in the balloon.

Explanation:

1. From the sample response, it says "Convection is the method of thermal energy that occurs in hot air balloons", so the first option is correct.
2. The sample response states "the air above the flame becomes warm and less dense, and rises", but the second option says "becomes more dense", so it's incorrect.
3. The sample response has "Cool, dense air sinks and takes the place of the warm air that rises. The cool air is warmed by the flame...", which matches the third option.
4. The sample response ends with "This cycle continuously warms up the air in the balloon", so the fourth option is correct.

Answer:

• Convection occurs in hot air balloons.
• Cool air in the balloon sinks and takes the place of the warm air that rises, and is warmed by the flame.
• The cycle continuously warms up the air in the balloon.