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  • 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_1065.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
  • 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
  • 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 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
  • 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
  • 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 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
  • 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_5111.jpg
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