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What is common of most volcanoes that have the most violent eruptions?

They feature magma with very high silica content.


What type of feature can form when magma hardens between horizontal layers of rock?

A concordant intrusive igneous feature like a sill can form when magma hardens between horizontal layers of rock. Sills are tabular bodies that are parallel to the surrounding rock layers.


Which intrusive feature may start as a sill but as more magma builds it pushes upward like a lens?

A laccolith is an intrusive feature that may start as a sill but as more magma accumulates, it can cause the overlying rocks to bend and create a dome-like shape. Over time, this dome can grow larger and form a lens-shaped intrusion beneath the Earth's surface.


An igneous intrusive feature that forms from a lens shaped mass of magma that arches the overlying strata upward is called a what?

An igneous intrusive feature that forms from a lens-shaped mass of magma that arches the overlying strata upward is called a laccolith. Laccoliths typically create a dome-like structure as the magma pushes the surrounding rock layers upward. They are often associated with volcanic activity and can vary in size.


An igneous intrusive feature that forms from the lens shape mass of magma the arches the overlying strata upward is called a what?

An igneous intrusive feature that forms from a lens-shaped mass of magma that arches the overlying strata upward is called a "laccolith." Laccoliths are typically dome-shaped and can create significant topographical features due to their ability to push the surrounding rock layers upward. They are formed when magma intrudes between layers of sedimentary rock but does not reach the surface.