Multiple choice

So why do you think density decreasing causes it to rise?

  1. the matter gets cooler

  2. the matter gets lighter

  3. the matter gets heavier

  4. the matter condenses

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When matter is heated, it expands and becomes less dense. Because it is less dense than the surrounding cooler matter, it becomes more buoyant and rises.