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Unformatted text preview: within 2-5 km depth from the surface. In the subduction zone, the magma forms at 20-30 km depth. Here melting is enhanced by the release of fluids from hydrated rocks of the oceanic crust. Magma also travels from very deep beneath the surface almost as deep as the Core Mantle Boundary. This magma traverses toward the surface as magma plume and forms volcanic islands. 3. List types of texture of igneous rocks and give an example of each? Porphyritic Glassy Vesicles Pyroclastic Basalt Gabbro Amphibole Obsidian-volcanic glass Pumice Tuff TYPE OF IGNEOUS ROCK EXAMPLE TYPES OF IGNEOUS ROCKS AND EXAMPLE Aphanitic Phaneritic...
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- Fall '10