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  • 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
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