Mojave River Valley Museum
Glossary of Terms & Definitions
Molten rock material, including dissolved gases and crystals, generated within the earth and capable
of intrusion and extrusion; considered the source of igneous rocks.
Also see: BASALT, IGNEOUS,
Volcanic Rocks, Cinder Cones and Lava Fields
While geologic complexities of Southern California are still under investigation, many researchers think that faulting, block movement, and associated magma ...
Igneous rocks form when molten rock (magma) originating from deep within the ... The insulating effect of the surrounding rock allows the magma to solidify very ...
Hole in the Wall Geology
As magma made its way from deep in the crust toward the surface it nudges the rock, ... The first magma to reach the surface exploded from several vents.
Introduction to Geology of the Mojave Desert
The crust is a puzzle made up of tectonic plates, shifting against one another over a molten layer of magma. During the changing relationship of the plates, ...
Vast expanses of solid minerals and simmering magma once fed explosive volcanoes miles above. Not all of the magma erupted at the surface. Much of the fiery ...
Ubehebe Crater - Death Valley
Following weaknesses in the Earth's crust, searing basaltic magma rose upward. ... Magma worked its way through the fault-weakened rock toward the surface.
A small quantity of basaltic magma encountered underground water producing a series of phreatic eruptions that are recorded in the black layers of pyroclastic ...
Tecopa Hot Springs
Tecopa hot springs is a "primary hot springs". Here, mineral water is geothermally heated by by magma chambers which exist miles under the Earth's surface.