Hostile Witness. A witness at a trial who is so adverse to the party that called him or her that he or she can be cross-examined as though called to testify by the opposing party. The Federal Rules of Evidence provide that witnesses who are hostile, or adverse, can be interrogated through the use of leading questions. hostile witness
Polar wander. Polar wander is the motion of a pole in relation to a fixed reference frame. It can be used, for example, to measure the degree to which Earth's magnetic poles have been observed to move relative to the Earth's rotation axis.
Main article: Apparent polar wander. The magnetic poles are relatively stationary in position over time and because of this, researchers often use magnetic minerals, like magnetite, in order to find at what latitude the continent was positioned relative to the magnetic poles of that time.