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  • Light filters into a lava tube known as Skylight Cave in Deschutes National Forest in Oregon, revealing the texture of its walls.
    Skylight-Cave_Texture_2686.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 shape resembling a volcano is visible on the wall of Subway Cave, a lava tube formed 30,000 years ago in California's Hat Creek Valley. The tube itself was formed when the top portion of the lava flow cooled to a hard crust while allowing hot lava to flow underneath. Eventually, the lava flow stopped, leaving behind the shell. This formation resulted from hot lava dripping from the ceiling of the tube.
    CA_SubwayCave_VolcanoShape_3617.jpg
  • Dramatic ice sculptures form in the Guler Ice Cave, a partially collapsed lava tube near Mount Adams, Washington. The cave, located near the community of Trout Lake, features thousands of icicles and other ice formations. One end of the lava tube is lower than the other, which scientists believes traps cold air in the lava tube year round.
    GulerIceCave_8446.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_1065.jpg
  • Dramatic ice sculptures form in the Guler Ice Cave, a partially collapsed lava tube near Mount Adams, Washington. The cave, located near the community of Trout Lake, features thousands of icicles and other ice formations. One end of the lava tube is lower than the other, which scientists believes traps cold air in the lava tube year round.
    GulerIceCave_8421.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 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
  • 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
  • Three shafts of sunlight illuminate Skylight Cave in the Deschutes National Forest in Oregon. Skylight Cave is a lava tube and light enters through three skylights. Two of the skylights are hornito skylights, formed where lava was ejected through the crust of a flow some distance from the source of the magma.
    Skylight-Cave_Three-Beams_2761.jpg
  • Lichen grows on the walls near the entrance of Beauty Cave, a 300-foot (100-meter) long lava tube in the Craters of the Moon National Monument, Idaho.
    CratersOfTheMoon_Beauty-Cave_2519.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
  • Three shafts of sunlight illuminate Skylight Cave in the Deschutes National Forest in Oregon. Skylight Cave is a lava tube and light enters through three skylights. Two of the skylights are hornito skylights, formed where lava was ejected through the crust of a flow some distance from the source of the magma.
    Skylight-Cave_Three-Beams_2749.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
  • 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
  • Three shafts of sunlight illuminate Skylight Cave in the Deschutes National Forest in Oregon. Skylight Cave is a lava tube and light enters through three skylights. Two of the skylights are hornito skylights, formed where lava was ejected through the crust of a flow some distance from the source of the magma.
    Skylight-Cave_Three-Beams_2771.jpg
  • Three shafts of sunlight illuminate Skylight Cave in the Deschutes National Forest in Oregon. Skylight Cave is a lava tube and light enters through three skylights. Two of the skylights are hornito skylights, formed where lava was ejected through the crust of a flow some distance from the source of the magma.
    Skylight-Cave_Three-Beams_2740.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
  • Thousands of icicles, including some that stretch from floor to ceiling, form in the Guler Ice Cave near Mount Adams, Washington. The cave is a partially collapsed lava tube formed during an eruption of Mount Adams during the past 20,000 years. One end of the cave is lower than the other and scientists think that traps cold air, which keeps the cave icy even during the summer. The Guler Ice Cave is located near the community of Trout Lake.
    GulerIceCave_8450.jpg
  • Thousands of icicles, including some that stretch from floor to ceiling, form in the Guler Ice Cave near Mount Adams, Washington. The cave is a partially collapsed lava tube formed during an eruption of Mount Adams during the past 20,000 years. One end of the cave is lower than the other and scientists think that traps cold air, which keeps the cave icy even during the summer. The Guler Ice Cave is located near the community of Trout Lake.
    GulerIceCave_8406.jpg
  • Subway Cave, located in Lassen National Forest, California, was formed 30,000 years ago by a lava flow in the Hat Creek Valley. During the flow, the top cooled and formed a hard crust while allowing hot lava to continue to flow underneath. Eventually, the lava stopped flowing, leaving behind this shell. Subway Cave is about a third of a mile (half a kilometer) in length.
    CA_SubwayCave_3606.jpg
  • Subway Cave, located in Lassen National Forest, California, was formed 30,000 years ago by a lava flow in the Hat Creek Valley. During the flow, the top cooled and formed a hard crust while allowing hot lava to continue to flow underneath. Eventually, the lava stopped flowing, leaving behind this shell. Subway Cave is about a third of a mile (half a kilometer) in length.
    CA_SubwayCave_3590.jpg
  • A purple ochre sea star (Pisaster ochraceus) wraps itself around and feasts on a mussel on the beach near Bandon, Oregon. Some sea stars, also known as starfish, force their stomachs into the shells of clams and mussels. That allows them to eat prey that's larger than what they can fit in their mouths.
    StarfishFeedingWrapped.jpg
  • Molten pahoehoe lava flows at the end of a lava tube in Volcanoes National Park, Hawaii. Pahoehoe is the hottest – and most liquid – form of basaltic lava. This ropy pahoehoe results with the thin crust partially solidifies. Lava continues to flow behind it, pushing and folding it, not unlike an accordion.
    HI_Volcanoes_Pahoehoe_8679.jpg
  • Pacific Ocean waves shoot 50 feet into the air through a tiny hole in a lava shelf off on the Kauai coast known as the Spouting Horn blowhole. It sounds like a whale breathing, but Hawaiian legend says the sound is actually the "lizard woman" moaning. She would attack anyone who got too close. One day she chased a fisherman into a lava tube. He escaped; she's still stuck.
    SpoutingHorn.jpg
  • Molten lava flows from an opening at the end of a lava tube from the Pu'u O'o Kila vent in Volcanoes National Park on Hawaii.
    LavaFlow-8663.jpg
  • Bright molten lava flows into the Pacific Ocean at twilight at Volcanoes National Park, Hawaii. The hot lava vaporizes the crashing waves, which reflect the lava's glow. The lava arrived at the ocean through an underground lava tube connected to the Pu'u O'o vent.
    LavaPacificOcean.jpg
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