RocksGroup7

__//** The Rock Cycle **//__ The Rock Cycle is a continuous, dynamic set of processes by which are changed into other types of rocks. The rock cycle is a model used to describe the changes to rocks that take place on the earth.Some procces occur near the earth's surface such as weathering, erosion and deposition.Other procces occur deep below the surface such as melting, increased heat and pressure.The

http://www.classzone.com/books/earth_science/terc/content/investigations/es0602/es0602page02.cfm ROCK CYCLE DIAGRAM
 * __The website below explains the rock cycle.__**

__**//Rock Cycle is made up of three types of rocks.//**__

=__**1** Igneous Rocks__=
 * Intrusive or extrusive rock formed from the cooling and crystallization of of magma or lava. LINK > http://geology.com/rocks/igneous-rocks.shtml

__Intrusive__- rock that formed when molten rock cools slowly and solidifies inside earths crust.

__Extrusive__- rock that formed when molten rock cools slowly and solidifies on earths crust.

__Felsic( ryolitic) magma__- light rocks

__Mafic ( Basaltic) magma__- Dark rocks

__Coarse-Grained__- having a rough, coarse texture. Many crystals

__Fine- Grained__- Fine, smooth grain small. No crystals

V__esicular__- has air pockets

__Non Vesicular__- Does not have air pockets.

The more time the rock is inside the earth's crust the bigger the cryatls are going to be. ==


 * __Types of Igneous Rocks:__**

Basaltic Glass= Extrusive, Glassy texture and it is non vesicular

Vesicular Basalt= Extrusive, Fine texture and it is Vesicular

Pumice= Extrusive, non crystaline, Vesicular and has a glassy texture

Granite= Intrusive, crystals are about 1mm to 10mm and its texture is coarse.

Gabbro= Dark, Intrusive, Crystals are about 1mm to 10mm and it is non Vesicular

Pegmatite= Intrusive, Crytals size are 10mm or larger, it is very coarse and it is non vesicular.

=__**2** Sedimentary Rocks__=
 * Formed in layers as the result of moderate pressure on accumulated sediments.LINK > http://geology.com/rocks/sedimentary-rocks.shtml

Three different types of sedimentery rocks. 1__. Clastic__= formed from solid fragment og other rocks. Lithification= is the compaction and cementation of rock fragment that form a sedimentary rock. Types of clastics are: Conglamerate= mixed of large rounded pebles cedemented by smaller pebles.

Breccia= has angular frafments.

Sandstone= of quartz grains. Size of grain is .006 to .2 cm

Shale= from the compaction of tiny flacks of clay.

__2. Chemical (Crystalline)=__ form from the percipation of minerals out of solution. Types of Chemical rocks:

Limestone= fizzes with acid( H C L), Contains shells ,It is like calcite.It is Chemical ( Crystalline) and Organc ( Bioclostic).

Dolostone= fizzes with acid( H C L). Its composition is Dolomite.

Rock salt= Same as Halite= taste like salt.

Rock Gypsum= Easily scrached with fingernail. Its composition is Gypsum.

3. __Organic ( BIoclostic)=__ The ramains of living things or rocks cintaininf fossils. Types of Bioclostic:

Coal= Made from burial of plants.Its composition is Carbon.

Limestone= fizzes with acid( H C L), Contains shells ,It is like calcite.It is Chemical ( Crystalline) and Organc ( Bioclostic).

=__**3** Metamorphic Rocks__=
 * Formed from older "parent" rock (either igneous or sedimentary) under intense heat and/or pressure at considerable depths beneath the earth's surface. LINK > http://geology.com/rocks/metamorphic-rocks.shtml

A metamorphic rock can be fliated or nonfoliated.

__Metamorphism__ - process of forming metamorphic rocks inside the lithosphere.

__Recrystallization-__ process of increasing the size of mineral crystals

__Foliation__- The parallel layers of minerals caused by pressures on the rock

__Dynamic metamorphism__- Is the crushing and ductile floe of rocks.

__**Types of metamorphic rocks:**__

Eclogite- A heavy metamorphic rock that forms by hydration.

Slate= Foliated, its grain size is fine and it is low grade metamorphism of shale.

Gneiss= Foliated, its grain size is medium to coarse and it has high grade metamorphism.

Anthracite coal= Ninfoliated, it is composed of carbon and its grain size is fine. \

Marble= Nonfoliated, its composition is calcite and dolomite and its grain size is fine to coarse.

Metaconglomerate= Nonfoliated, it is composed of various materials and its grain size is Coarse.

__Sites Used__ []

http://www.classzone.com/books/earth_science/terc/content/investigations/es0602/es0602page02.cfm ROCK CYCLE DIAGRAM

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