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Why are metamorphic rocksformed by contact metamorphism usually not as dense as those formed by regional metamorphism?
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.
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
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.
Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by reg?
Because in contact the rock actually comes in contact with magma, this joins with the rock, so when it cools and become igneous rock, it's denser. In regular, or regional, the rock is formed from intense heat and pressure, but does not actually come in contact with magma.
Describe how contact metamorphism is different from regional metamorphism?
Contact metamorphism occurs when rocks are subjected to high temperatures and pressures due to being in close proximity to an igneous intrusion, leading to localized changes in mineralogy and texture. In contrast, regional metamorphism affects large areas of rocks over a wide region due to tectonic forces such as mountain building or subduction, resulting in widespread changes in mineralogy and texture. Contact metamorphism is therefore more localized and less intense compared to regional metamorphism.
Are rocks changed by metamorphism less dense?
No, rocks that undergo metamorphism can become more dense due to the rearrangement of mineral crystals and the recrystallization of minerals. This densification process can occur through the removal of pore spaces and the formation of more tightly packed mineral grains.
Are rocks that are changed by metamorphism more porous or less?
Than?? Marble certainly isn't porous.
Why are metamorphic rocksformed by contact metamorphism usually not as dense as those formed by regional metamorphism?
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.
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
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.
Light-colored igneous rocks are less what than dark-colored igneous rocks are?
less dense
Why are metamorphic rocks formed by contact metamorphism usually not as dense as those formed by reg?
Because in contact the rock actually comes in contact with magma, this joins with the rock, so when it cools and become igneous rock, it's denser. In regular, or regional, the rock is formed from intense heat and pressure, but does not actually come in contact with magma.
What is the contenental crust made up of?
less dense rocks such as granite.
Describe how contact metamorphism is different from regional metamorphism?
Contact metamorphism occurs when rocks are subjected to high temperatures and pressures due to being in close proximity to an igneous intrusion, leading to localized changes in mineralogy and texture. In contrast, regional metamorphism affects large areas of rocks over a wide region due to tectonic forces such as mountain building or subduction, resulting in widespread changes in mineralogy and texture. Contact metamorphism is therefore more localized and less intense compared to regional metamorphism.
What kinds of rocks are changed by weathering?
All rocks are changed, but it depends on the density. A smooth, hard volcanic rock may take a while to weather because it has less friction, but a bumpy less dense rock may weather faster. However, all rocks wear down by means such as human touching, water, wind, or friction with other rocks. For example in tourist caves some rocks have become smooth from the human touch repeated over and over.
Light colored igneous rocks are less what than dark igneous rocks?
Dense. Light colored igneous rocks have lower density compared to dark colored igneous rocks due to their higher silica content, which results in slower cooling and the formation of larger crystals.
Why do magma's rise toward the earth's surface?
Rocks become less dense when they melt
