USA Finance

Aug 31 2018

Igneous rock composition and texture

#where #can #you #find #igneous #rocks #Ask GeoMan. How do composition and texture relate to igneous rocks? Igneous rocks are crystalline solids which cool from magma: the liquid phase of solid rock. Magmas occur at depth in the crust, and are said to exist in magma chambers, a rather loose term indicating an area where the temperature is great enough to melt the rock, and the pressure is low enough to allow the material to expand and exist in the liquid state. Many different types of igneous rocks can be produced. The key factors to use in determining which rock …

Mar 4 2018

60 of the world – s happiest facts

#fantastic #facts, #mama #nature, #pure #genius, #reason #rocks, #the #lab, #animal #kingdom, #facts, #genius, #quotes, #space, #world #wonders # 1. A group of flamingos is called a flamboyance. 2. If you fake laugh long enough you ll start to really laugh, really, really hard. 3. The book cover to the prize winning short story collection, Spellbound. was chosen because author, Joel Willans, bought his wife s engagement ring with poker winnings. 4. The Beatles used the word love 613 times throughout their career. 6. Every year, millions of trees grow thanks to squirrels forgetting where they buried their nuts. 7. …

Sep 6 2017

Igneous Rocks Classified by Composition #where #can #you #find #igneous #rocks

# Igneous Rocks by Composition Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene . Mafic rocks are dominated by plagioclase and pyroxene (even if you can’t see them with the naked eye) and smaller amounts of olivine. Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase ) and mafic minerals (mainly hornblende . pyroxene. and/or biotite ). There is little or no quartz. Felsic rocks are mostly feldspar (especially K-feldspar ), at least 10% quartz . and less than 15% mafic minerals (biotite. hornblende ). Within these four groups, …