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lava

  • (inkknife_2000, Wikimedia Commons)
    The Wonderful World Inside Lava Caves
    Walker Rhea
    Do you live near a dormant volcano? You might have a weird wonderland right beneath your feet.
  • (Dave Bunnell, Wikimedia Commons)
    Lava Caves Part 1
    Walker Rhea
    In Hawaii, there's a lava cave named Kazumura that's over 40 miles long, the largest in the world. When a volcano erupts, it sends lava rivers rushing downhill. As these rivers flow, their sides and surfaces crust over, forming a tunnel.