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∙ 16y agoUltrabasic rocks are generally found on earth's surface in areas of mountain building.
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As compared to ultramafic rocks mafic rocks have a?
greater proportion of silica
The average composition of rocks comprising a large composite cone or stratovolcano is similar to what magma?
ultramafic
Is peridotite felsic mafic intermediate or ultramafic?
Ultramafic
How are igneous rocks classified acording to their..?
Igneous rocks are classified by either being intrusive or extrusive, then mafic or felsic then they are classified by either fine grain or course grained textures.
Is ultramafic magma high in viscosity?
No. Ultramafic magma would have a low viscosity.
As compared to ultramafic rocks mafic rocks have a?
greater proportion of silica
Is olivine mafic or felsic?
Olivine is a mafic mineral. It is most abundant in ultramafic rocks.
What is unusual about peridotite and dunite?
They are the only two ignous rocks that are ultramafic.
Is olivine an important mineral in peridotites and other ultramafic rocks?
yes
What rocks are classified as?
Mantle rock is classified as ultramafic igneous rock.
Why aren't there very many extrusive ultra-basic rocks?
Ultramafic rocks have a very high melting temperature. Earth's interior is no longer hot enough to produce eruptions of molten ultramafic material.
WHAT ARE Mantle rocks classified as?
Mantle rock is classified as ultramafic igneous rock.
Rocks in the Earth's mantle contain a higher percentage of what than do rocks in the Earth's crust?
Ultramafic minerals, iron, magnesium.
What rock is composed mainly of ferromagnesian minerals?
Ultramafic rocks are made of ferromagnesian minerals.
What is ultamafic?
Ultramafic is a term used to describe igneous rocks made solely of mafic minerals.
The average composition of rocks comprising a large composite cone or stratovolcano is similar to what magma?
ultramafic
What is the difference in ultramafic rocks and mafic rocks?
Ultramafic rocks like peridotite and dunite, are igneous rocks that have a very low silica content and very high levels of iron and magnesium. They are therefore more dense than most igneous rock and are found at great depth but appearing on the surface due to volcanic eruption.
