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).
How magma chambers form. The decrease in pressure allows rocks in this part of the Earth to melt and collect in magma chambers where they erupt as pillow basalt on the ocean floors. Boundaries of the lithosphere. The boundary with the lithosphere lies between 100 and 200 kilometers deep. Scientists do not know for certain the depth of the lower boundary but it is approximately 700 kilometers deep. Earthquake waves in this part of the Earth travel much slower than they do in the lithosphere because of the density of the rocks.