A brinicle is a hollow tube of ice that forms beneath sea ice when salt-rich brine leaks out, sinks, and freezes the water around it. The brine is denser and colder than the seawater, so it sinks, pulls in surrounding water, and keeps extending the icy tube downward like an inverted stalactite. If it reaches the seafloor, the brine spreads into a web of ice and can freeze slow-moving creatures such as starfish and sea urchins in its path.
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