| 1. | Other viscous lava flows have been erupted from satellite cones.
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| 2. | The eruption ends with a flow of viscous lava.
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| 3. | Highly viscous lavas do not usually flow as liquid, and usually form explosive fragmental ash or tephra deposits.
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| 4. | However, a degassed viscous lava or one which erupts somewhat hotter than usual may form a lava flow.
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| 5. | The mountain s concentric ridges and broad summit plateau suggest formation from a single huge mass of spreading viscous lava.
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| 6. | This trend towards the production of more felsic, viscous lavas could be a sign of a waning mantle plume.
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| 7. | Cerro Chasc�n was formed by a series of viscous lava flows while Cerro Aspero appears to be a single solfataric activity.
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| 8. | The more viscous lava forms tend to show sheeted flow features, and blocks or breccia entrained within the sticky lava.
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| 9. | Explosive eruptions may decrease and be followed by the eruption of viscous lava to form a lava dome in the newly formed crater.
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| 10. | They were probably formed by extrusions of highly viscous lava that was too sticky to flow very far down-slope from their vents.
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