If an electric train moves south, which direction does the train smoke go? answer

no direction

because its electric so there is no smoke produced

if someone is smoking the it will move in south direction xD

No smoke will be produced

The correct answer is Magnetic minerals on the sea floor

The magnetic minerals behaves like the magnets that aligns themselves during the cooling process. The alignment takes place in the direction of the earth's magnetic field and becomes solidified in this way only. Normal polarity of minerals is having the same polarity like that of earth. In contrast the reversed polarity is alignment opposite to the polarity of the earth.This creates a zebra like pattern.

Thus, this zebra like pattern shows the evidence of sea floor spreading.