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Granite Core

 

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What property of obsidian makes it an exception to the geologic definition of a rock?

And what gases are released when volcanoes erupt? Why don't flood basalts build volcanic cones? What is the difference between the feldspar found in gabbro and the feldspar found in granite? How are ultramafic rocks formed? What facts make it probable that the earth's core is composed of iron?

Obsidian is volcanic glass - it is a melt which cools too fast for nucleation to occur.
Gases - CO2, SO2, H2S and steam (H2O)
Flood basalts are effusive in nature: The magma is relativly fluid - it flows easily. They erupt from fissures, and flow out, so no cone.
Gabbro contains Calcium-rich plagioclase feldsparsand granite contain alkali (K, Na) feldspars. A granite is more silica rich than a gabbro and in addition to felspar it has free quartz. A gabbro cannot have free quartz, by definition. It is the plutonic equivalent of a basalt.
Ultramafic rocks are derived by melting of the mantle and partial crystallisation of the ultra-mafic material (the most iron and Magnesium rich minerals, which have the highest melting point) and removal of the remainder of the melt - which will then crystallise as a basalt or other intermediate igneous rock. The process is called magmatic differentiation.
It is deduced that the core is made of Iron with some nickel, because of the calculated density, the seismic properties, and the magnetic field of the earth - also meteorites are found with this composition which makes it likely that they are derived from similar differentiated planets like ours. I have given you some good websites to help find more information.

Granite Core Bit System


 

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Trust in players pays off for Monterey Trail
T.J. Ewing is a player's coach, game-time gruff when he needs to be and opened-arms compassionate otherwise.