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  • The Ape Cave makes a sharp bend in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Bend_5094.jpg
  • Several lava rocks hang over the floor of the Ape Cave in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is a lava tube, formed during an eruption of Mount St. Helens 2,000 years ago. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The rocks once hung from the ceiling of the cave, but broke off while lava was still flowing through the tube. They traveled with the flow until they became wedged in a narrow passage.
    WA_Ape-Cave_Lava-Rocks_5114.jpg
  • The ceiling of the Ape Cave, a lava tube in the Mount St. Helens National Volcanic Monument in Washington state, somewhat mimics the shape of the passage below. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Ceiling_5111.jpg
  • The Ape Cave gently curves in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Passage_5087.jpg
  • The ceiling of the Ape Cave, a lava tube in the Mount St. Helens National Volcanic Monument in Washington state, somewhat mimics the shape of the passage below. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Ceiling_5110.jpg
  • A lava rock known as the "meatball" hangs over the floor of the Ape Cave in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is a lava tube, formed during an eruption of Mount St. Helens 2,000 years ago. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The meatball once hung from the ceiling of the cave, but broke off while lava was still flowing through the tube. It traveled with the flow until it became wedged in a narrow passage.
    WA_Ape-Cave_Meatball_5116.jpg
  • A narrow passage of the Ape Cave gently curves in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Narrow-Curve_5091.jpg
  • Water that drips into the Ape Cave collects into a stream as it flows through North America’s third-largest lava tube, located in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The cave is 13,042 feet long (3,975 meters) and the rock is porous, allowing rainwater to seep in.
    WA_Ape-Cave_Stream_5105.jpg
  • Water that drips into the Ape Cave collects into a stream as it flows through North America’s third-largest lava tube, located in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The cave is 13,042 feet long (3,975 meters) and the rock is porous, allowing rainwater to seep in.
    WA_Ape-Cave_Stream_5104.jpg
  • Two hardened tubes are visible in the Ape Cave, a lava tube located near Mount St. Helens in the Gifford Pinchot National Forest in Washington state. The ape cave formed about 2,000 years ago during the only known period when fluid basaltic lava erupted from the volcano. The outside edges of the lava flow cooled first, providing a crust that allowed fluid lava to continue flowing inside. This period of activity may have lasted a year during which the lava level rose and fell, leading to the unique shapes inside the cave. The Ape Cave lava tube is 13,042 feet (3976 meters) long, ranking as the third-longest in North America. The cave is named for a local hiking club, the St. Helens Apes.
    WA_Ape-Cave_Two-Tubes_5130.jpg
  • The horseshoe-shaped crater of Mount St. Helens is visible in this aerial view of the Washington state volcano. During the May 18, 1980 eruption, the north face of the volcano collapsed. Since then, new lava domes have formed in the crater and are visible here. Mount St. Helens now stands ‎8,363 feet (2,549 meters), losing about 13 percent of its summit in the 1980 eruption. It is the most active volcano in the Cascade Range during the Holocene epoch (past 10,000 years).
    MountStHelens_Crater_Aerial-View_Alp...jpg
  • Three prominent Washington state volcanoes are visible over the Cascade foothills in this aerial view taken from over North Bend, Washington. In the center, Mount Rainier, with an elevation of 14,411 feet (4,392 meters), is the tallest mountain in Washington and the highest volcano in the Cascade Range. At left, Mount Adams, at 12276 ft. (3742 m), is the second-tallest mountain in the state. At right is Mount St. Helens, a 8,365 feet (2,550 m) volcano that lost nearly 15 percent of its height in a 1980 eruption. The body of water in the lower-right is the Howard A. Hanson reservoir, used for flood control and to provide drinking water to Tacoma.
    Rainier_Adams_St-Helens_Aerial_1417.jpg
  • Towering hummocks - piles of debris from the 1980 eruption of Mount St. Helens - are found along the Hummocks Trail at the Mount St. Helens National Monument in Washington.
    StHelens_Hummocks_6317.jpg
  • Moss begins to overtake the rocky landscape within the blast zone at Mount St. Helens National Monument, Washington. This image was captured nearly 30 years after the violent May 18, 1980 eruption. The first wildflowers began to appear in this spot about 20 years after the eruption.
    MountStHelens_lichen_6801.jpg
  • Life returns to the blast zone near Mount St. Helens in Washington state. Trees line a large pond. Large hummocks -- hills of volcanic debris -- are visible behind the pond.
    MountStHelens_Hummocks_Pond_6807.jpg
  • Mount St. Helens glows bright white in the alpenglow after sunset. The Toutle River winds through the blast zone created during the May 18, 1980 eruption. That eruption reduced the Washington mountain's summit from9,677 feet (2,950 m) to 8,365 feet (2,550 m).
    MountStHelens_Alpenglow_6841.jpg
  • The sun sets behind Mount St. Helens, rendering it in silhouette in this view from Mount Adams, Washington.
    StHelens_silhouette.jpg
  • One of the many steam eruptions of Mount St. Helens in the fall of 2004 sends a towering column of water vapor high into the air. The mountain is reflected in Silver Lake.
    StHelensEruption.jpg
  • Grasses and summer wildflowers, including Indian paintbrush, begin to restablish the otherwise barren hillside beneath Johnston Ridge in Mount St. Helens National Monument, Washington.
    StHelens_Wildflowers_6335.jpg
  • Thich fog bunches up and spills over a hillside above Smith Creek in Mount St. Helens National Monument, Washington.
    StHelens_FogFalls_3422.jpg
  • The full moon sets behind Mount St. Helens, which is framed by a dramatic fog falls and blooming summer wildflowers, including foxglove and Indian paintbrush.
    MountStHelensFogMoon.jpg
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