These ethereal polar clouds, stunning to look at, form when stratospheric temperatures drop below –108 Fahrenheit. Composed of frozen nitric acid and sulfuric acid, they portend a thinning of the ozone layer. This spring a large hole is developing in the ozone above the Arctic, scientists say.
Credit Card Identification Number
This number is recorded as an additional security precaution.
4 digit, non-embossed number printed above your account number on the front of your card.
3-digit, non-embossed number printed on the signature panel on the of the card immediately following the card account number.
3-digit, non-embossed number printed on the signature panel on the back of the card.