
  Because of (or on account of) what circumstance do you get up early?


is a question that (2) can answer, but (1) cannot.  This takes advantage of the fact that in (2) you are indicating both a reason to get up early, and also a fact -- namely, that there is a bus to take (I 'can' catch a bus implies that there is a bus to take).

In (1) you might try to get up early to catch a bus, without expecting that one is very likely to be there.  You might think there's only a fifty-fifty chance.

By contrast, I don't think that there is any question that (1) answers that (2) doesn't also answer.  The reason is that (2) has 'extra information' but otherwise implicitly indicates a purpose, just like (1).

How to ask a question according to the specific sections?
In the Honor Harrington universe, ship-to-ship combat takes two forms: missiles and direct energy weapons.

Missiles come in two forms - bomb-pumped lasers and contact nukes.  Both use multi-megaton nuclear initiations to damage enemy ships.

While this sort of event on a planetary surface will obviously have lasting effects, what long-term effects could be expected in a vacuum environment, aside from the destructive force associated with the explosions themselves, and the resulting EMP?  Especially, would there be lingering (or spreading) radiation?
