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Which type of instructive feature forms when magma is injected into fractures the cut across rock layers?

The instructive feature that forms when magma is injected into fractures that cut across rock layers is called a "dike." Dikes are typically vertical or steeply inclined and can vary in thickness, often cooling quickly as they intrude into the surrounding rock. They are formed when magma forces its way into existing cracks, solidifying as it cools and creating a distinct geological feature.


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.