Why do volcanic rocks have different textures?
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All volcanic rocks have, as their origin, melted rock. This melt is called magma while underground, lava when it hits the surface. read more
Igneous rocks have different textures for two reasons. The first reason is that the magma from which the igneous rocks were made can be acid (having a lot of silica in it like Granite) or basaltic (having less silica and a lot more dark minerals). read more
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Igneous Rock Textures
www.indiana.edu
Igneous Rocks: Everything You Need to Know
www.thoughtco.com
The types of rock: igneous, metarmorphic and sedimentary
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