 The Letter B
The letter B represents a Dike. Stratovolcanoes are built by many alternating eruptions of lava and ash. The magma below and inside the mountain exerts a lot of pressure on the crust and on the volcano itself. The magma pushes its way through small cracks in the crust and finally reaches the surface. This causes a dike to be produced.
A dike is an intrusion of magma that cuts through layers of already existing rock..
Click on "Next" icon to find out what happens when magma reaches the surface of the volcano!
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