geo-sg2 - Geol 100 Planet Earth Exam II Study Guide 3/5/08...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Geol 100 Planet Earth Exam II Study Guide 3/5/08 Dr. Stewart 1 I. Mineralogy Definition of a mineral and three ways to make a mineral A homogenous, naturally occurring, solid inorganic substance with a definable chemical composition and an internal structure characterized by an orderly arrangement of atoms, ions, or molecules in a lattice. 1) Crystallize a mineral from a melt 2) Precipitate minerals from water 3) Products of reactions between other minerals Diagnostic Features, Crystal structure and composition, and Polymorphism II. Three rock types and the rock cycle • Igneous = ‘from fire’ • Sedimentary = ‘settled from water’ • Metamorphic = ‘change shape’ Rock Cycle = Relationships between the three rock types
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
III. Igneous rocks and magmatic-volcanic systems – Did you know that igneous rocks are the most abundant rock type in the crust? You do now. Intrusive and Extrusive and Hypabyssal portions of the system Magma chamber Supplied by melt Stored and precesses magma Magma = melt and crystals Rocks derived from depth = intrusive Volcanic system Conduit to surface Lava = magma extruded onto surface Rocks from volcano = extrusive. Cooling rates and crystal size Intrusive (from sills/dikes) = cools slowly, therefore giving the crystals time to grow Extrusive = cools quickly (freezes) little time for crystals to grow
Background image of page 2
Phenocryst = large crystal imbedded in fine matrix growing in magma chamber and ewre erupted with lava. Gabbro, Granite, Basalt and Rhyolite ??? IV. Sedimentary Rocks: Did you know that sedimentary rocks comprise > 65% of continental surface! You do now. Two types: Clastic and chemical sedimentary rocks
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course GEOL 100 taught by Professor Michaelstewart during the Spring '08 term at University of Illinois at Urbana–Champaign.

Page1 / 6

geo-sg2 - Geol 100 Planet Earth Exam II Study Guide 3/5/08...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online