igneous rocks. when magma cools and _______, the result is an ________ rock. there are _____ factors...

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