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Poll
What brand of blade do you use ?
Butterfly
Metamorphic rock I_vote_lcap41%Metamorphic rock I_vote_rcap
 41% [ 18 ]
Stiga
Metamorphic rock I_vote_lcap18%Metamorphic rock I_vote_rcap
 18% [ 8 ]
DHS
Metamorphic rock I_vote_lcap5%Metamorphic rock I_vote_rcap
 5% [ 2 ]
Donic
Metamorphic rock I_vote_lcap14%Metamorphic rock I_vote_rcap
 14% [ 6 ]
Yasaka
Metamorphic rock I_vote_lcap7%Metamorphic rock I_vote_rcap
 7% [ 3 ]
729 Friendship
Metamorphic rock I_vote_lcap7%Metamorphic rock I_vote_rcap
 7% [ 3 ]
JOOLA
Metamorphic rock I_vote_lcap2%Metamorphic rock I_vote_rcap
 2% [ 1 ]
Killerspin
Metamorphic rock I_vote_lcap2%Metamorphic rock I_vote_rcap
 2% [ 1 ]
Andro
Metamorphic rock I_vote_lcap2%Metamorphic rock I_vote_rcap
 2% [ 1 ]
Xiom
Metamorphic rock I_vote_lcap2%Metamorphic rock I_vote_rcap
 2% [ 1 ]
Total Votes : 44
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kosovohp



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PostSubject: Metamorphic rock   Metamorphic rock I_icon_minitimeFri Dec 31, 2010 4:55 am

Metamorphic rock is the transformation of an existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat and pressure (temperatures greater than 150 to 200 °C and pressures of 1500 bars[1]) causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above it. They can form from tectonic processes such as continental collisions, which cause horizontal pressure, friction and distortion. They are also formed when rock is heated up by the intrusion of hot molten rock called magma from the Earth's interior. The study of metamorphic rocks (now exposed at the Earth's surface following erosion and uplift) provides us with information about the temperatures and pressures that occur at great depths within the Earth's crust.
Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite.

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