Silt! Glacial flour! Walking along glacier outwash streams your boots often become covered with a sticky layer of gray mud. Where glacial streams run fast they carry a load of silt so dense you can't see your hand just an inch below the surface. When the stream shown here reaches the ocean, the silty water mixes with seawater and is pushed by the incoming tide farther into Wachusett Inlet. When the tide goes out, the swirling mix is drawn in the reverse direction and flows out into Muir Inlet. Photographer: Bill Eichenlaub