The Rock Cycle
There are three types of rocks,Sedimentary,Igneous and Metemorphic.
http://geology.com/rocks/ The first rock from left to right metamorphic rock and the one in the middle is sedimentary and last but not least is the igneous rock.
http://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle.html
Types of Rocks
Igneous rocks are classified by there origin,texture and mineral composition.The origin of an igneous rock is either extrusive rock,rock forms from lava that erupted into earths surface,or intrusive rock,rock that formed beneath earths surface.Texture of the igneous rock depends on the size of its crystals.The texture of the igneous rock can be fine grained,coarsed grained, glassy or porphyritic.Intrusive rock usually has larger crystals than extrusive rocks.Porphyritic rocks have large crystals scattered on a background of much smaller crystals.The less silica the darker the rock,but magma that is high in silica usually forms light colored rocks
Sedimentary rocks form from sediments,small,solid peices of material that come fromrocks or living things.The pocesses that which sediments transform into sedimentary rock are compaction and cementation.Compaction is the process that presses sediments together. cementation is the process in which desolved minerals c rystallize and glue particles of sediment together.There are three types of sedimentay rock,clastic rock,organic rock,chemical rock.Clastic rock is a sedimentry rock that forms when rocks fragment are squeezed together.Clastic rocks are grouped by the size of the rock fragments,or particles,of which they are made.Examples of clastic rock are shale,sandstone,and conglomerate.Organic rock forms where the remains of plants and animals are deposited in thick layers.Examples of organic rocks are coal and limestones.Chemical rock forms minerals that are dissolved in a solution crystalized.For example,limestones can form when calcite that is dissolved in lakes,seas,or underground water comes out of the solution and forms crystals.
Metamorphic rocks are classified by the arrangement of grains that make up the rocks.Metamorphic rocks that have there grains arranged in parallel layers or bands are said to be foliated.A common foliated rock is slate,heat and pressure change the sedimentry rock shale into slate.Heat and pressure deep beneath earths surface can change any rock into metamorphic rock.Some metamorphic rocks are nonfoliated.Metamorphic rocks that are nonfoliated do not split into layers.For example marble and quarzite both have nonfoliated texture.
Rock Cycle
Forces inside earths and at the surface produce a rock cycle that builds, destroys,in changes the rocks in the crust.The changes of the rock cycle have a lot to do with plate tectonics.Plate movements drive the rock cycle by pushing rock back into the mantle,where they melt and become magma again.Plate also cause the folding,faulting and uplift of the crust that moves rocks through the rock cycle. Igneous,Sedimentary, and Metamorphic rocks change continuously through the rock cycle.
Types of Rocks
Igneous rocks are classified by there origin,texture and mineral composition.The origin of an igneous rock is either extrusive rock,rock forms from lava that erupted into earths surface,or intrusive rock,rock that formed beneath earths surface.Texture of the igneous rock depends on the size of its crystals.The texture of the igneous rock can be fine grained,coarsed grained, glassy or porphyritic.Intrusive rock usually has larger crystals than extrusive rocks.Porphyritic rocks have large crystals scattered on a background of much smaller crystals.The less silica the darker the rock,but magma that is high in silica usually forms light colored rocks
Sedimentary rocks form from sediments,small,solid peices of material that come fromrocks or living things.The pocesses that which sediments transform into sedimentary rock are compaction and cementation.Compaction is the process that presses sediments together. cementation is the process in which desolved minerals c rystallize and glue particles of sediment together.There are three types of sedimentay rock,clastic rock,organic rock,chemical rock.Clastic rock is a sedimentry rock that forms when rocks fragment are squeezed together.Clastic rocks are grouped by the size of the rock fragments,or particles,of which they are made.Examples of clastic rock are shale,sandstone,and conglomerate.Organic rock forms where the remains of plants and animals are deposited in thick layers.Examples of organic rocks are coal and limestones.Chemical rock forms minerals that are dissolved in a solution crystalized.For example,limestones can form when calcite that is dissolved in lakes,seas,or underground water comes out of the solution and forms crystals.
Metamorphic rocks are classified by the arrangement of grains that make up the rocks.Metamorphic rocks that have there grains arranged in parallel layers or bands are said to be foliated.A common foliated rock is slate,heat and pressure change the sedimentry rock shale into slate.Heat and pressure deep beneath earths surface can change any rock into metamorphic rock.Some metamorphic rocks are nonfoliated.Metamorphic rocks that are nonfoliated do not split into layers.For example marble and quarzite both have nonfoliated texture.
Rock Cycle
Forces inside earths and at the surface produce a rock cycle that builds, destroys,in changes the rocks in the crust.The changes of the rock cycle have a lot to do with plate tectonics.Plate movements drive the rock cycle by pushing rock back into the mantle,where they melt and become magma again.Plate also cause the folding,faulting and uplift of the crust that moves rocks through the rock cycle. Igneous,Sedimentary, and Metamorphic rocks change continuously through the rock cycle.
GLOSSARY
Igneous rock- A type of rock that forms from the cooling of molten rock at or below the surface
Sedimentary Rock- A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
Metamorphic Rock- A type of rock that forms from an existing rock that is change by heat,pressure or chemical reaction.
Fine-Grained- Rapid cooling lava forms igneous rock with small crystals.
Coarse-Grained- Slow cooling magma forms igneous rock with large crystals
Sediment- Small,solid pieces of material that comes from rocks or organisms.
Compaction-The process of sediments are pressed together under their own weight.
Cementation- The process by which dissolved minerals crystallize and glue particles of sedimentary together into one mass.
Clastic Rock- Sedimentary rock that forms when rock fragments are squeezed together under high pressure.
Organic rock- Sedimentary rock that forms where remains of organisms are deposited in thick layers.
Chemical rock- Sedimentary rock that forms when minerals crystallize from a solution.
Texture- The look and feel of a rock's surface determined by the size, shape, and pattern of a rock's grains.
Rock cycle- The cycle of which rocks are recycled in the plate tectonics.
Igneous rock- A type of rock that forms from the cooling of molten rock at or below the surface
Sedimentary Rock- A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
Metamorphic Rock- A type of rock that forms from an existing rock that is change by heat,pressure or chemical reaction.
Fine-Grained- Rapid cooling lava forms igneous rock with small crystals.
Coarse-Grained- Slow cooling magma forms igneous rock with large crystals
Sediment- Small,solid pieces of material that comes from rocks or organisms.
Compaction-The process of sediments are pressed together under their own weight.
Cementation- The process by which dissolved minerals crystallize and glue particles of sedimentary together into one mass.
Clastic Rock- Sedimentary rock that forms when rock fragments are squeezed together under high pressure.
Organic rock- Sedimentary rock that forms where remains of organisms are deposited in thick layers.
Chemical rock- Sedimentary rock that forms when minerals crystallize from a solution.
Texture- The look and feel of a rock's surface determined by the size, shape, and pattern of a rock's grains.
Rock cycle- The cycle of which rocks are recycled in the plate tectonics.