Geothermal vent

Volcano

 * Main Article: Volcano

A volcano is a geothermal vent at the Earth's surface through which magma (molten rock) and associated gases erupt, and also the cone built by eruptions.

Volcanic eruptions are important for creation science because they can provide vivid examples of how catastrophic processes are able to form features that are typical of the fossil record (i.e. layered rock). Since uniformitarian thought dominates geology today, much of the earth's features have been interpreted as having formed slowly over long periods of time. In some cases volcanoes, like Mount St. Helens, have illustrated that catastrophic processes are able to form thick beds of rock with fine laminae.

Geyser

 * Main Article: Geyser

Black smoker

 * Main Article: Black smoker