A mound of viscous lava that has been extruded from a volcanic vent.
- Experts watching a recent spike in volcanic activity say a lava dome in the mountain's crater is growing.
- Geologists said the lava dome inside the volcano is now deforming, or growing, by tens, maybe hundreds, of feet.
- Rising magma continues to build a lava dome in the crater of Mount St. Helens.
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