Which geological feature results primarily from sediment accretion within an oceanic trench in a subduction zone?

💡 Explanation

When sediments accumulate within an oceanic trench during subduction, an accretionary wedge forms because the sediments are scraped off the downgoing plate. Therefore accretionary wedge formation results, rather than ridge development, rift expansion or hotspot volcanism which require different tectonic settings.

• Which mechanism causes island arc formation when oceanic lithosphere subducts beneath other oceanic lithosphere?
• Which mechanism increases magma silica content as an oceanic plate subducts beneath continental crust?
• Which outcome arises when a major river's stream gradient decreases due to regional tectonic subsidence?
• Which risk increases when a large glacial lake outburst flood (GLOF) occurs toward lower elevations?
• What drainage pattern indicates underlying fractured bedrock's primary influence on stream orientation?
• Which risk increases near transform plate margins during locked phases?