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Ash on Lava

In northern Navka, radar-dark wind streaks have been blown across radar-dark lava flows, indicating a SE-NW wind direction. The darkness of the streaks indicates they are composed of small, fine-grained material that is too smooth to return a strong radar signal. The radar-dark lava flows beneath the streaks are dark because they are smoother than the rougher, radar-bright lava flows to the left. Because the streaks are associated with lava flows, they may be composed of fine ash from the volcanic eruption that produced the flows.

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