Which outcome occurs when degassing reduces viscosity of lava?

💡 Explanation

More extensive shield volcanoes form because reduced viscosity allows lava to flow further, promoting effusive eruptions via magma ascent, rather than explosive ones; therefore, A, rather than pyroclastic flows which are related to high viscosity magma.

• Which process causes the smoothing and shaping of desert ventifacts?
• Which phenomenon maintains longitudinal dune alignment despite turbulent winds?
• Which outcome occurs when deforestation removes vegetation alongside levees?
• Which outcome is intensified by the Ekman spiral effect in mid-latitude North Atlantic gyres?
• Which mechanism primarily diminishes near-surface chlorophyll concentrations across equatorial Pacific during El Niño events?
• Which mechanism disrupts global thermohaline circulation when extensive freshwater enters Arctic sea?