Which term describes the process in which two crustal plates collide, forcing one under the other?

Which term describes the process in which two crustal plates collide, forcing one under the other?

• A. Supplier of Choice
• B. Star facet length percentage
• C. Specific gravity (SG)
• D. Subduction

Answer: (D)

Subduction is the process described. In plate tectonics, the lithosphere is divided into slabs that float atop the mantle. When two crustal plates collide, the denser plate tends to sink beneath the other and descend into the mantle. This downward-moving slab creates a subduction zone, often forming deep ocean trenches and triggering volcanic activity where the overriding plate melts and magma rises. The movement also generates earthquakes as the descending plate bends and interacts with the surrounding rock. Other terms here don’t describe a geological process of plate movement—one is a business term, another is a gem-cutting measure, and the last is a density metric. Subduction uniquely captures the idea of one plate being forced under the other during collision.

Subduction is the process described. In plate tectonics, the lithosphere is divided into slabs that float atop the mantle. When two crustal plates collide, the denser plate tends to sink beneath the other and descend into the mantle. This downward-moving slab creates a subduction zone, often forming deep ocean trenches and triggering volcanic activity where the overriding plate melts and magma rises. The movement also generates earthquakes as the descending plate bends and interacts with the surrounding rock.

Other terms here don’t describe a geological process of plate movement—one is a business term, another is a gem-cutting measure, and the last is a density metric. Subduction uniquely captures the idea of one plate being forced under the other during collision.