Results for: Intrusion

In Geology

What does intrusion mean?

An intrusion can be either the act of intruding (an intrusion into his private life) or a thing that intrudes (the excavations were an intrusion on their heritage).
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In Geology

What rocks are intrusive?

Intrusive is a term that applies to igneous rocks that form from magma underground such as granite.
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In Science

Is gneiss intrusive?

Gneiss is not an igneous rock, so it is not intrusive or extrusive.  It is a metamorphic rock that was originally granite.
In Geology

Is quartzite intrusive?

Quartzite is not considered to be intrusive or extrusive. It is a  metamorphic rock that probably started out as sandstone.
In Geology

How does an intrusion form?

An intrusion is the injection of one material into another. To  form, one material has to be more fluid than the other (eg mud,  water or magma) so that it behaves hydraulic (MORE)
In Geology

What does intrusive mean?

In science terms it is a term to describe Igneous Rocks that have  solidified from magma underground. Extrusive is the same thing but  it is when the rock solidified above g (MORE)

Why is granite intrusive?

Granite is an igneous rock and is formed from magma. Granitic magma has many potential origins but it must intrude other rocks. Most granite intrusions are placed at depth wit (MORE)

Is caldera intrusive?

No. A caldera is a volcanic structure. It is formed by the collapse  of a volcao rather than a magma body.
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