At about a mile deep, the Lava River Cave is the longest lava tube in Oregon. It was created by lava from volcanic eruptions flowing through to feed the front of the lava flow. The temperature in the cave is a cool 40°F year-round. There are some geologic formations similar to other caves, and some specifivally volcanic. Hollow cylindrical “soda straws” were formed by escaping gases, and other cone-shaped formations were created by remelted lava dripping down from the ceiling. Toward the back of the tube, sand gets thicker and thicker until it completely blocks off passage. We made it as far as hands and knees would allow.
No comments:
Post a Comment