I don’t know the writing that you are referring to. Though, I am sure it would mean adding to the feeling of secretiveness or sneakiness.
Can you add more information
Students, whose parents are in the military, often move around a lot.
or
<span>Students whose parents are in the military, often move around a lot.</span>
An Extrusive igneous rock cools very fast on the surface and is created by <span>lava,</span> since the cooling process is very fast extrusive igneous rocks have very small crystals.