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Rocks !!

Igneous sedimentary metamorphic By Amanda Matoe
by

Darfield Student

on 20 April 2010

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Transcript of Rocks !!

Igneous rocks Igneous rocks form when liquid
magma cools down , and they
form as crystal structured rocks. Igneous rocks are divided into
two groups : intrusive and extrusive ... Intrusive rocks : rocks that began their
life below the surface
and cooled below the
surface are intrusive
rocks Extrusive rocks : rocks that cooled to a
crystal formation on the
surface of the earth are
reffered to as extrusive
rocks Sedimentary rocks Sedimentary rocks form from immense force pressing down on lower layers of sediment. many minerals bond the sediment together causing it to form a sedimnet rock Metamorphic rocks Metamorphic rocks form
deep within the Earth,
when heat and pressure
are applied to either igneous
rocks, or sedimentary rocks. The rock cycle !!! Granite , Pumice , Obsidian , Basalt , and Gabbro are all igneous rocks. Igneous rocks are suitable to be used for road building materials because they are so hard. They are also used for gravestones and when cut into sheets and polished they are used in banks and offices . Different igneous rocks have different uses : Granite: Used for long lasting monuments, for trim and decoration on buildings. Pumice: Because they are so light, it is used quite often as a decorative landscape stone. If grounded to a powder, it is used as an abrasive in polish compounds and in Lava soap. Crystalline Igneous rocks can be used for jewelery and other similar things. Countertops and building stone.
Lava soap, building materials, landscaping Slate, gneiss, skarn, phyllite, amphibolite, schist, quartzite, marble, and granulite are all metamorphic rocks. Limestone, Dolomite, Sandstone, Shale are all sedimentary rocks. Marble can be used to make floor tiles, counter tops and it is carved into statues. Slate is used in buildings for floor tiles and roofing tiles and it was once used for blackboards Metamorphic rocks can be used for building components, monuments, countertops, and facings. Sedimentary rocks can be used for gravel and other household utensils another use is as chalk on a black board in primary schools and other places.
Gypsum is used to make plaster of Paris and in drywall and board chalk Sandstone and limestone are used as building stone and in the production of glass. Limestone is also used for hard core in roads, and is cooked to make cement. Shale is mixed with sand
and used to make bricks. Iron ores are mined and smelted to create iron metal. Smectite clay is used as a digestive cure. Salt is an essential food Coal is burned to create energy. ROCKS !!! By Amanda Matoe
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