Begin Slideshow. 1  If you've got a Trader Joe's in your neighborhood, chances are it's your go-to supermarket. It's cheap, convenient, and the snacks are unbeatable. 2  When I sent out an office poll about people's favorite items, I quickly found I wasn't the only one who can't get enough of what that grocery store offers.
Addendum: Differentiation of magma (fractional crystallization) also plays a big role in creating felsic magmas from mafic magmas. Also, granite can form at convergent boundaries that involve continental crust only (e.g., Indian and Asian plates).
When magma reaches the surface, it is called lava. When lava has cooled, it forms a type of rock called igneous rock, which means âfrom fireâ. Volcanoes can form in 3 major ways: 1. Volcanoes at Convergent Boundaries Most volcanoes form at convergent boundaries called subduction zones. At these boundaries, oceanic plates subduct below continental plates. As the denser oceanic plate sinks down, heat from the Earth melts the plate and the rock becomes magma.