<p>The name "Pictured Rocks" comes from the streaks of mineral stain that decorate the cliffs. Stunning colors occur when groundwater oozes out of cracks and trickles down the rock face. Iron (red and orange), copper (blue and green), manganese (brown and black), and limonite (white) are among the most common color-producing minerals.</p>
<p>Colorful Cliffs at Pictured Rocks NL. The cliffs extend 15 miles along Lake Superior. They are up to 200 feet high.</p>
<ul><li>Keywords: Pictured Rocks National Lakeshore; piro; pictured rocks; sandstone; lake superior; color; minerals; cliffs; erosion</li></ul>
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