My Unanswered Magnetism Questions--Answered!

After asking my older sister, (who demonstrated knowledge about high school-level magnetism that even she didn't know she had) I have the answers to my questions!! XD

Now answered Question 1: What is the difference between magnetic lines of force and magnetic field lines?

Answer: Actually, there is no difference. The arrows on magnetic field lines represent the direction of magnetic force at that point in the field (the magnetic force is the force that causes something, like an iron filing or a compass needle, to move because of a magnetic field). So, magnetic field lines are lines of force as well.

Now answered Question 2: What is meant by the magnetic field is "cancelled out"?

Answer: "Cancelling out" a magnetic field does not mean there is no magnetic field there. It simply means that because the two interacting magnetic forces (the arrows on field lines) are equal but in opposite directions, so the net magnetic force at that point is zero. If a compass needle, for example, was put at a point like this, it would experience equal pull in opposite directions. Therefore, it would not move.

Now answered Confusing Part about Declination: How can the angle be different at different places?

Answer: Looking at the picture below and listening to my sister, I realized that while the compass needle will swing towards the magnetic north pole from any point on the Earth, true north is always just straight up. I thought that the angle was between a line drawn to the magnetic north pole and a line drawn to true north, but it's really just between a line drawn to the magnetic north pole and a line drawn straight up. 

Sources: My sister, and the image, which comes from http://en.wikipedia.org/wiki/Magnetic_declination