would a compass work in the underground?

Answer 1

I use one underground regularly. The magnetic field pervades the whole planet. Magnetic objects or rocks can distort the measurements, but they can at the surface too.

Even if you were so deep underground that your compass was above the Curie Point and lost it's magnetism (in which case you would be dead as that is over 500 degrees), you could still use a fireproof electronic flux-gate compass, as the magnetic field is generated by the molten iron core (nobody is exactly sure how), so the field is present at all temperatures.

Answer 2

yes, definitely- upto the point where temperatures demagnetise the compass.

Earth's flux exists at almost all practically achievable depths. Below that the temperature is so high that the magnetic needle will get de-magnetised and lower still, will melt down.
Anyways, theoretically speaking, if it were possible to maintain the magnetism of the needle intact even at the core of earth, it will still display the same directions- because the magnetic field of the earth still works except at the absolute centre- as in any other magnet.

Answer 3

Yes it would work underground.

But would have to figure in what is around you that may or may not cause a magnetic field.

Answer 4

Yes

Answer 5

Yes, since the lines of flux come from the north and south poles.

Answer 6

Yes. The earths magnetic field is everywhere. Try it.

Answer 7

Since I'm viewing in "All English" mode, your question can be taken two ways-----i.e. below the Earth's surface--------in the subway.

In either case, the answer is Yes.

Answer 8

Depends on the depth, and crust materials.

Answer 9

SURE, but what happens to it if it melts..