Which process is driven by mantle convection?

• A. Ocean currents
• B. Weather systems
• C. Mantle convection
• D. Deep-sea currents

Answer: (C)

Mantle convection is heat-driven movement inside Earth’s mantle, where hot rock rises and cooler rock sinks. This slow circulation acts as the engine that powers the movement of tectonic plates at the surface, which drives geological activity like earthquakes, volcanoes, and the formation of mountains.

The surface processes listed—ocean currents and weather systems—are controlled mainly by surface winds, solar heating, and atmospheric or oceanic density differences, not by deep mantle flow. Deep-sea currents are driven by wind patterns and water density in the oceans, not by mantle convection. So the most direct process linked to mantle convection is the convective flow itself in the mantle, which underpins plate tectonics and related interior dynamics.