If you're referring to streams/rivers of water that run independently of another source in the ocean these are referred to as "currents" and can be very powerful depending on their location.
Roughly 7! 7 x 48 is 336 which is two short so maybe just say 8 to be safe.
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Kettle lakes are usually form when there is left over buried ice blocks that are melting so baiscly it’s left behind ice that is buried and melting
