El Niño years have twice the average precipitation, and La Niña years have one quarter of the average precipitation. If all years are either El Niño or La Niña (i.e. no neutral years), how often does El Niño occur?
What if you allow neutral years?
Answer to Quizlet 1: Northbound, port-side
Seeing something setting means you are looking West. If it is rotating counter-clockwise, then you are rotating clockwise. Facing West + rotating clockwise means Northbound. If you are Northbound and looking West, you must be on the left (port) side of the aircraft.