Question

multiple-choice question
heating something up causes particles to...
spread apart
pack together
rewatch

Explanation:

When an object is heated, the particles (atoms or molecules) gain kinetic energy. This increased energy makes them move faster and spread out from each other. In contrast, cooling causes particles to lose energy and pack together. So heating causes particles to spread apart.

Answer:

A. spread apart (assuming the first option is labeled A, as the first checkbox with "spread apart" is the correct choice)