Magma that hardens vertically underneath the surface will form a sill. select the best answer from the choices provided t f
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This is false
Sills are not formed by magma that hardens vertically underneath the surface.
A sill is a horizontal layer of igneous rock that forms between older (preexisting) rock beds. Sills are formed when magma squeezes between older rock layers and hardens to form a slab of rock. Sills may have vertical to horizontal orientations due to rotation caused by tectonic processes, but the most common sills are the nearly horizontal ones.
Magma that hardens vertically underneath the surface will form a dike, not a sill.