Marker Name: Lava Tubes
Marker Text: The opposite wall of the Gorge exposes two lava tubes. One, partially collapsed, looks like a cave. The other tube was plugged by a later lava flow. How many separate lava flows can you count?
Lava tubes are formed by the raped cooling of the outer surface of a basalt flow, while the hot lava continues to flow underneath. As the molten lava drains out, it leaves behind a hollow tube.
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