Volcanic neck
If magma is solidified it will form
Volcanic rocks are often more resistant to erosion than surrounding rock
Erosion has exposed many valuable minerals.
The rock or rocks will undergo weathering and erosion.
erosion and deposition
batholith
If magma is solidified it will form
What would later become the granite domes of Yosemite formed when granitic magma accumulated underground and solidified in place. The area was later uplifted by tectonic forces and erosion exposed the domes while the erosion-resistant granite largely stayed in place.
A volcanic neck is eventually exposed by erosion of the surrounding softer rock.
Volcanic rocks are often more resistant to erosion than surrounding rock
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
Enchanted Rock is estimated to be around one billion years old. It formed underground as a large blob of molten magma that solidified and was later exposed through erosion.
PVC is cheaper but is used differently. PVC is usually baried in ground and emt usually runs exposed. You can use PVC exposed if it is schedule 80 gray PVC electrical conduit. Schedule 40 is for under ground
Stone Mountain formed from a granite pluton that solidified underground around 300 million years ago. Over time, erosion exposed the granite, resulting in the distinct dome-shaped structure we see today.
This is known as a volcanic plug or neck. Please see the related link for more information.
an exposed conduit used for carrying electrical wires/cables
Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.