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Cave
Gore's Cave
Boise City-Nampa, ID, Idaho
33.1 miles SE of Boise City-Nampa, ID, IdahoLava Tube - Cave. These are formed when fluid, molten lava flows out of the ground, it behaves like a stream of water working its way downhill. But soon the "stream" surface cools and hardens. This crust then insulated the molten lava inside, enabling it to keep flowing. The molten lava inside the crust eventually flows out leaving the crust as the walls of a lava tube or "cave."
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