AICE Marine Science Practice Exam 2025 - Free Marine Science Practice Questions and Study Guide

Hydrothermal vents are primarily created by divergent plate boundaries. At these locations, tectonic plates move away from each other, allowing magma from the mantle to rise and create new oceanic crust. As seawater seeps down through cracks in this crust, it is heated by the underlying magma. This heated water then rises back to the ocean floor through the vents, carrying dissolved minerals and gases.

The unique conditions at divergent plate boundaries, specifically the interaction of seismic activity and molten rock, are essential for the formation of hydrothermal vents. This process contributes not only to the creation of new geological features but also supports a unique ecosystem that thrives in the extreme conditions around the vents, such as deep-sea organisms that rely on chemosynthesis rather than photosynthesis. The specific geological and hydrothermal processes at divergent boundaries make them the primary sites for these fascinating underwater structures.