FELSIC ROCKS: texture Intrusive Extrusive Muy extrusive GraniteRhyoliteObsidian.

FELSIC ROCKS: texture

IntrusiveExtrusive

Muyextrusive

Granite Rhyolite Obsidian

Yosemite Valley: El CapitanYosemite Valley: El Capitan

Intrusive: slow cooling, large texture

ARROWHEADSARROWHEADS

Extrusive: fast cooling, fine texture

Igneous Rock TypesIgneous Rock Types

Figure 11.7

SLATESLATE

Because slate easily flakes, it’s ideal forFloors, roofs, blackboards.

GNEISSGNEISS

Gneiss is characterized by a banded or foliated pattern.Granite is a precursor rock to gneiss

Stress and StrainStress and Strain

FoldingFolding

Figure 12.8

Normal fault

Footwall moves Up relative toHanging wall

Tension forces

FOOTWALL

HANGING WALL

NORMAL FAULTNORMAL FAULT

Reverse FaultReverse Fault

Strike-slip FaultStrike-slip Fault

San Andreas FaultSan Andreas Fault

Figure 12.12

FELSIC ROCKS: texture Intrusive Extrusive Muy extrusive GraniteRhyoliteObsidian.

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Transcript of FELSIC ROCKS: texture Intrusive Extrusive Muy extrusive GraniteRhyoliteObsidian.

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