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Igneous - Extrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust.

Sedimentary - Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension.

Metamorphic - Metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up.

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Igneous
Igneous rock is formed when magma cools and solidifies, it may do this above or below the Earth's surface

Sedimentary
Sedimentary rocks are formed by sediment that is deposited over time, usually as layers at the bottom of lakes and oceans.

Metamorphic
Metamorphic rocks can be formed by pressure deep under the Earth's surface, from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

info: http://image.slidesharecdn.com/typesofrockgr-150326031242-conversion-gate01/95/types-of-rock-gr-6-8-638.jpg?cb=1427357667
http://www.sciencekids.co.nz/sciencefacts/earth/sedimentaryrocks.html

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Igneous -
Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.

Site: https://en.wikipedia.org/wiki/Igneous_rock

Sedimentary -
Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.

Site: https://en.wikipedia.org/wiki/Sedimentary_rock

Metamorphic -
A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes. Examples of these rock types include marble, slate, gneiss, schist.

Site: http://www.onegeology.org/extra/kids/metamorphic.html

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sedimentary:  Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.
https://en.wikipedia.org/wiki/Sedimentary_rock

Metamorphic: Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form".
https://en.wikipedia.org/wiki/Metamorphic_rock

Igneous:Igneous rocks from when hot ,liquid rock ,or magma ,cools and solidifies.

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Sedimentary - sedimentary is types of rocks and it made when mineral and organic particles settle in one place.

Metamorphic - Metamorphic rocks made by transformation of existing rock types. When rock have lots of pressure or heat it became metamorphic.

Igneous -

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Sedimentary-Sedimentary is formed .

Metamorphic- Metamorphic is formed when changes in pressure,temperature,or a chemical makeup alter a rock,metamorphism takes place.

Igneous-

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Sedimentary:
Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.
https://en.wikipedia.org/wiki/Sedimentary_rock

Metamorphic:
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form"
https://en.wikipedia.org/wiki/Metamorphic_rock

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Igneous : Igneous rocks are formed from melted rock that has cooled and solidified

Sedimentary : Sedimentary rocks are formed at the surface of the Earth, either in water or on land.
Metamorphic : Sometimes sedimentary and igneous rocks are subjected to pressures so intense or heat so high that they are completely changed. They become metamorphic rocks.

http://www.kidsloverocks.com/html/types_of_rocks.html

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How sedimentary rocks formed: sedimentary rock forms when mud and sand are deposited into layers on the earth’s surface and later buried.

How metamorphic rocks formed: Metamorphic rock is formed underground through a process that changes a rock's molecular structure due to pressure, heat and chemical reactions.

How how igneous rocks formed:

Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partialmelts of existing rocks in either a planet's mantle or crust.

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Sedimentary -

Metamorphic - Metamorphic is a rock that changed shape by heat and pressure.

Igneous - Igneous rocks form when lava and magma gets cooled.

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sedimentary - Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water
source= https://en.wikipedia.org/wiki/Sedimentary_rock

metamorphic - metamorphic rocks often may look like igneous rocks except that they do show bands of colour.

igneous - Igneous rocks ,ay be found in many colours and often show different - coloured crystals that are no in bands.

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Sedimentary - Sedimentary rocks often have distinct parallel layers.
Metamorphic - Metamorphic rocks may show signs of bending and distortion
Igneous - Igneous rocks may contain crystals, which frequently can be seen by the unaided eye.

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Cici is the world most 美腻漂酿的baby                                               Alice is not 美腻漂酿

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Cici is the world most 美腻漂酿的baby                                               Alice is not 美腻漂酿

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Sedimentary- Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension.

Metamorphic -They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks.

Igneous- Igneous rock are made when lava cooled and solidified.

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sedimentary
Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.

metamorphic
Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form".

Igneous
Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic.

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Alice is more 美腻漂酿 than Cici(Cici is my 呕像）

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Alice is more 美腻漂酿 than Cici(Cici is my 呕像）

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Sedimentary- They are made from bits of eroded rock, mineral grains, and plant and animal remains that have been pressed together over time.

Metamorphic-Metamorphic rock is a result of a transformation of a pre-existing rock.

Igneous-The rocks that  formed when magma cools are called Igneous.

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Sedimentary-  Press together and get the sedimentary rocks.

Metamorphic- Heat or pressure.

Igneous- When the lava cooling.

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IGNEOUS - Igneous rocks are formed when the volcano explodes, and the lava cools down. If it cools down underground, it's called Intrusive Igneous, and if it cools down on ground, it is called Extrusive Igneous.
SEDIMENTARY-Sedimentary rock forms when rocks are pressed together and it creates Sedimentary.
METAMORPHIC-Metamorphic rocks are formed when it is affected by extreme heat&pressure, and it has many layers.

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Sedimentary - Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension.
https://en.wikipedia.org/wiki/Sedimentary_rock

Metamorphic - Metamorphic rocks are formed by other rocks that are changed by heat and pressure.

Igneous - Igneous rocks are formed when the volcano explodes, and the lava cools down.

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IGNEOUS- Igneous rocks are formed when volcano erupt and the lava cools down.It may do this above or below the Earth's surface.

SEDIMENTARY- Sedimentary rocks are formed when pieces of rock are pressed and cemented together.Sediments are deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension.

METAMORPHIC-

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Metamorphic is formed when changes in pressure, temperature or a chemical.
If a rock is a metamorphic it should have calcite, garnet, graphite etc.
Sedimentary is formed when sand breaks rocks into pieces.
Igneous is formed when hot rock, or liquid rock, or magma, cools and solidifies.

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Sedimentary: Many precipitate coming together by weather or some nature things. Some of sedimentary looks colourful with many layers, and some of the sedimentary looks kind of crystal.
Igneous: The mineral under or inside of  volcanic, some of them mix with magma. They look very crystal, some of them are with many holes inside of them.
Metamorphic: This mineral stay in or beside the water for a long time, and that change their colour and the shapes of them. Some of them are crystal some of them are not.

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Sedimentary

Sedimentary rocks are formed from sediment deposited by water or air.

Metamorphic

Metamorphic rocks are denoting rock that has undergone transformation by heat, pressure, or other natural thing.

Igneous
Igneous is relating to or involving volcanic processes.

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1. Sedimentary rocks often have distinct parallel layers.
2. Igneous rocks may be found in many colours and often shows different-coloured crystals that are not in bands.
3. Metamorphic rocks may show signs of bending and distortion.

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Sedimentary - sediments press together to form new rock.

Metamorphic - Heat and Pressure.

Igneous - Magma and lava cooling.

Key Words - grain, streak, crystals.