Which process causes the lateral flow of partially molten rock beneath the lithosphere at volcanic rift zones?

💡 Explanation

When a plate thins at volcanic rift zones, channelized asthenospheric upwelling concentrates focused decompression because density gradients increase lateral pressure along zones of lithospheric thinning, resulting in focused magma influx. Therefore channelized upwelling results, rather than other mechanisms requiring different compositional attributes.

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