Chapter4a igneousrocks

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Grotzinger • Jordan Understanding Earth Sixth Edition Chapter 4: IGNEOUS ROCKS Solids from Melts © 2011 by W. H. Freeman and Company Chapter 4: Chapter Igneous Rocks: Solids from Melts Melts About Igneous Rocks About • Igneous rocks form from liquid rock Igneous (magma) in several different ways. (magma) • Igneous processes within the Earth Igneous produce intrusive igneous rocks. • Igneous processes on or near Earth’s Igneous surface produce extrusive igneous rocks. surface 1. How Do Igneous Rocks Differ from One Another? from Texture – size of crystals Coarse-grained rocks (phaneritic) Fine-grained rocks (aphanitic) Mixed texture rocks (pophryritic) 1. How Do Igneous Rocks Differ from One Another? from Clues about significance of texture Early studies of volcanic rocks Laboratory crystallization studies Studies of slow cooling in granite Pyroclasts Volcanic ash Extrusive rocks Bomb Pumice Mafic Basalt Felsic Rhyolite Gabbro Granite Porphyry Intrusive rocks Phenocrysts Porphyry Extrusive pyroclasts form in violent eruptions...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online