It is called a dike.
Lava is just magma that has reached the surface.
Dykes are geological formations characterized by vertical or near-vertical walls of rock that cut across existing strata. They are typically formed from molten magma that intrudes into cracks in the surrounding rock and solidifies. Dykes can vary in composition, size, and orientation, and they often exhibit features such as a fine-grained texture due to rapid cooling. Additionally, they can serve as indicators of tectonic activity and are commonly associated with volcanic regions.
Mount Pinatubo primarily erupts dacitic magma.
It was liquid rock (magma) which solidified after an extrusion or eruption. Crustal rocks can re-dissolve into magma during subduction of oceanic crust.
Lava.
The magma that squeezes into vertical cracks between rocks and then hardens is called a dike. Dikes are tabular bodies of igneous rock that cut across the existing rock layers.
Magma that hardens after being forced into a crack across rock is called a dike.
Magma that hardens in a horizontal crack typically forms a thin, sheet-like intrusion called a sill. Sills are created when magma is injected parallel to the existing rock layers. As the magma cools and solidifies, it forms a horizontal layer of igneous rock within the crack.
That would be a type of igneous intrusion known as a dike.
Commonly referred to as a sill.
sills
It forms a sill.
When magma hardens inside the Earth's crust, it can form vertical columns known as dikes, and horizontal layers called sills. Dikes form when magma cuts through pre-existing rock layers, while sills are formed when magma intrudes between existing rock layers.
If vertical, a dyke; if horizontal, a sill.
eruption
when magma is squeezed into horizontals craks are called sill
Igneous rock is what forms when magma cools and hardens.