Which outcome occurs when volcanic ash flows compact?

💡 Explanation

Hot ash compacts into ignimbrite through welding because the high temperatures fuse the particles together; therefore, a solid rock layer forms, rather than a slurry developing due to mixing with water.

• Which process explains pyroclastic flow formation during Plinian volcanic eruptions?
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• Which process decreases when glacial freshwater reduces salinity?
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• Which process drives the thermohaline circulation when surface water become denser?