Which geographic alteration results when large magma volumes load Earth's crust, creating isostatic depression?

💡 Explanation

When large magma volumes accumulate depositionally, exceeding the mantle's yield strength causes isostatic depression due to mantle flow, leading to crustal subsidence, inducing regional sea level rise called transgression. Therefore transgressions occur, rather than seismic faulting, glaciation, or weathering which depend on different drivers.

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