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.

• Which risk increases when seismic waves encounter a soil layer with high pore water pressure during an earthquake?
• Which topographical feature forms down-slope following sediment deposition during episodic flooding cycles?
• Which hazard increases for loose sediments during intense seismic shaking from an earthquake?
• Which mechanism dictates volcanic eruption explosivity when magma's silica content rises above approximately 65%?
• Which material erosion results when atmospheric pressure gradients accelerate particles?
• Which mechanism allows strike-slip motion on the Mendocino transform fault to cause localized uplift along segments?