Which mechanism explains shield volcano formation associated with mantle plumes?

💡 Explanation

When a mantle plume reaches the surface, effusive eruption occurs because it brings magma of low viscosity (basaltic) from the deep mantle, allowing it to flow over large areas. Therefore, broad shield volcanoes form, rather than calderas, high-silica cones or preferential erosion, which require different magmatic sources and eruption styles.

• Which erosion event results from high pore liquid pressure in sediments on steep volcanic slopes?
• Which landform develops when solifluction lobes advance over previously deposited sediments?
• Which mechanism amplifies stream erosion when deforestation occurs on steep slopes within equatorial rainforests?
• Which mechanism redirects air masses eastward at approximately 30 degrees latitude within Hadley cells?
• Which consequence results when isostatic rebound stresses pre-existing fjord bedrock?
• Which mechanism contributes to eruptive style changes by volatile exsolution during magma ascent?