Final answer:
A geyser is an intermittent spring that ejects columns of water and steam at various time intervals. It is a natural phenomenon that occurs when underground water is heated by magma and reaches boiling point, causing a drop in pressure and resulting in an eruption of steam and water.
Step-by-step explanation:
A geyser is an intermittent spring that ejects columns of water and steam at various time intervals. It is a natural phenomenon that occurs when underground water is heated by magma and reaches boiling point, causing a drop in pressure and resulting in an eruption of steam and water. Geysers, such as those found in Yellowstone National Park, are a dramatic display of thermodynamic principles in nature.