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.
polar circle - a line of latitude at the north or south poles. horse latitude - either of two belts or regions near 30 degrees north or 30 degrees south; characterized by calms and light-baffling winds. line - a spatial location defined by a real or imaginary unidimensional extent.