Pointâofâsale transactionsâi.e., swiping a card at the time of purchaseâsecurely encrypt the. credit card data. Cards placed on file for future transactions, such as for express checkâout, use. tokens to access card data.
The outermost layer of Earth is the atmosphere. I say the atmosphere is the outermost layer, because it is as much a part of the of our planet as the atmosphere of other planets is a part of their definition.
The outermost layer is called the upper mantle, and goes down to a depth of 410 km. Below that is the the transition zone (660 km), then the lower mantle reaching a depth of 2,891 km. The various layers of the mantle have different types of rocks.