The answer is: D the box will NOT move or change. Hope this helps!
Mercury expands when it is heated. This process is called thermal expansion.
Here is what radioactive decay is:
<span>Radioactive decay is the spontaneous breakdown
of an atomic nucleus resulting in the release of energy and matter from
the nucleus. Remember that a radioisotope has unstable nuclei that does
not have enough binding energy to hold the nucleus together.</span>
