Rare white rainbow lights up the North Pole.

Questions:

1.What is a fog bow ?

2. Have you ever seen such rare phenomena?

        This is the amazing moment a white rainbow streaks across the Arctic sky.

        The rare phenomena, named a fog bow, was spotted by Sam Dobson during a recent expedition to the North Pole.

        As their ice breaking ship cruised through the chilly waters, Sam clocked the arching rainbow but was stunned to see it was completely white.

        A fog bow is a similar phenomenon to a rainbow, but it appears as an arch in fog rather than rain. And because of the very small size of water droplets that cause fog, smaller than 0.05 millimetres, it appears as a white arc, rather than a multi-coloured one.