igneous rocks. when magma cools and _______, the result is an ________ rock. there are _____ factors...
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Igneous Rocks
•When magma cools and _______, the result is an ________ rock.
•There are _____ factors that affect whether a rock will melt or not.▫Temperature (heating above __________)▫Pressure ▫And presence of _______ in the rock
(adding water).
Partial melting
•This is the process by which different minerals in a rock melt at different ___________.
•The _______ of magma is the reverse of partial melting.
•Chemicals that have a high ___________, crystallize first.
•The crystallization and removal of different minerals from the cooling magma is called __________________.▫They tend to settle at the ______ of magma
chamber.
Textures of Igneous Rocks
•Igneous rocks are classified according to ______ the magma cools and hardens.▫_______ igneous
Cools deep inside the crust▫________ igneous
Cools on the earth’ssurface
Textures of Igneous Rocks• ______-grained
▫Intrusive rocks▫_____, well
developed crystals▫Have a coarse
gained texture▫Cools slowly
• _____ grained▫_____ mineral grains
that cannot be seen by eye.
▫cools rapidly▫Small _______
Other Igneous Rock Texture• Glassy
▫Small % percentage of ______ gases.▫Example ______
• Vesicular texture▫Rapid cooling full of _____ are
called vesicles.▫Example ______
• ________ texture▫Some igneous cools slowly then
quickly as it nears the surface.▫Have a mixture of _____ &
______crystals.▫Example _______
Composition of Igneous Rocks • Determined by chemical ___________.• They are divided into _____ families
▫______ Rock Large proportion on silica, light color Many common rocks
▫_____ Rock Contains lower proportions of silica than felsic
rock Rich in _____ and __________
▫Intermediate Rocks These types of rocks are in between Felsic and
Mafic in their proportions of _______.
Intrusive Rocks
•They form ________.•Intrusions form when ______ intrudes or
enters into the rock masses and then cools.▫______ & stocks▫Laccoliths▫_____ and dikes
Extrusive Rocks
•Igneous rocks that form on the earth’s _______.▫Lava flows▫Lava _______▫Volcanic necks