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Because contact metamorphism usually occurs because of an increase in temperature. In contrary, regional metamorphism is usually the result of compression. Compression makes a rock more dense.

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Q: Why are metamorphic rocksformed by contact metamorphism usually not as dense as those formed by regional metamorphism?
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Related questions

How do the effects of contact metamorphism compare with those of regional metamorphism?

contact and regional metamorphic are similar because both of them happen cause of hot heat and pressure which make the rock metamorphic


How is contact metamorphism different from regional metamorphic?

contact metamorphism is what happens when something is really hot. regional metamorphism on the other hand involves much larger packages of rocks.


What are the types of rock metamorphism?

Types of metamorphism are Contact Metamorphism Regional Metamorphism Cataclastic Metamorphism Hydrothermal Metamorphism Burial Metamorphism Shock Metamorphism (Impact Metamorphism)


What two geological processes are involved in changing sedimentary rock to a metamorphic rock?

The two processes resulting from sedimentary into metamorphic rock are known as contact metamorphism and regional metamorphism. Regional metamorphism most notably involves two tectonic plates colliding, while contact metamorphism occurs due to the intrusion of magma.


What are the 4 types of metamorphism?

contact metamorphism, regional metamorphism, dynamic metamorphism


What is the difference between regional and contact metamorphism?

Regional metamorphism is the creation of metamorphic rock from large geographically significant processes like plate tectonics. Contact metamorphism is the creation of metamorphic rock from the proximity of an existing rock to a heat source provided by a plutonic intrusion.


If the sedimentary rock limestone is subjected to metamorphism what metamorphic rock will likely form?

Limestone can metamorphose into marble, a regional metamorphic rock, or into skarn, a contact metamorphic rock.


What is 2 types of metamorphic rocks?

Metamorphic rocks are formed by the process of extreme heat, pressure and other chemicals. Two types of metamorphism are dynamic which makes the pressure and extreme heat and thermal which is caused by the heat of magma from a volcanic eruption.


Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by regional metamorphism?

Contact metamorphism does not cause profound compaction, which is the reduction in size of the spaces between mineral particles due to increases in pressure. Regional metamorphism causes compaction and possibly recrystallization, increasing the density of the rock.


Is soapstone regional or contact metamorphism?

Very low grade regional metamorphism.


On on what basis can metamorphic rocks be identified?

Metamorphic rocks can be identified if the rock is foliated or nonfoliated, foliating type, type of metamorphism (contact/regional), and by probable original rock. :)


What two processes can change a rock into a metamorphic rock?

The two processes resulting from sedimentary into metamorphic rock are known as contact metamorphism and regional metamorphism. Regional metamorphism most notably involves two tectonic plates colliding, while contact metamorphism occurs due to the intrusion of magma.