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The Columbia Plateau flood basalts were very fluid eruptions along lengthy fissures. Being very fluid, they didn't pile up, but rather flowed outward in broad sheets. Volcanic peaks are formed around central vents. As the lava pours out it solidifies generally not very far from its source, stacking up layer upon layer.

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13y ago
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Q: How do the eruptions that created the Columbia plateau differ from eruptions that create volcanic peaks?
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