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 innermost zone is called the inner core which is a solid, spherical mass of iron, having a radius of 1,216 km. Above it is the outer core which is a layer of molten liquid rich in nickel and iron. It is about 2,270 km thick. The outer core is overlain by the mantle, which is solid but soft.