volcanic theory

volcanic theory

[väl′kan·ik ′thē·ə·rē]
(astronomy)
A theory which holds that most features of the moon's surface were formed by volcanic eruptions, lava flows, and subsidences when lunar rocks were plastic. Also known as igneous theory; plutonic theory.
References in periodicals archive ?
The debunking of the volcanic theory was heartening news for the local people.
As evidence for the volcanic theory, these scientists have maintained that volcanoes can bring iridium-rich rock from the Earth's mantle to the surface.
Proponents of the volcanic theory have suggested that the Deccan eruptions caused the K-T extinctions by spewing out sulfur and other volcanic material that darkened the skies, cooled the planet and produced acid rain.
Courtillot concedes that the shocked quartz remains a problem for the volcanic theory, but Officer disagrees.
Acid rain also plays a role in the volcanic theory of the origin of mass extinctions, whose strongest proponent, Charles B.
In support of the volcanic theory, on the other hand, Officer and Drake believe there is direct evidence for large-scale movement of magma to the surface around K/T time.