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Fast and slow are relative terms. If a heated igneous rock takes 3 hours to cool, is that fast or slow?

During their formation, however, magma can solidify very slowly or very quickly. Rocks that have cooled quickly from magma are referred to as extrusive igneous rocks, such as obsidian and scoria. Rocks that have formed from slow cooling magma are called intrusive igneous rocks, such as granite and gabbro. The difference between the two types is in their grain size. Slow cooling magma produces large grained rock, and fast cooling magma produces fine-grained rock.

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Do intrusive rocks have large crystals because they cool quickly?

No. Intrusive igneous rocks have large crystals because they cool slowly.


What type of rock can be extrusive or intrusive?

Igneous rocks can be either extrusive or intrusive. Extrusive igneous rocks form from lava cooling quickly on or near the Earth's surface, resulting in small crystals. Intrusive igneous rocks form from magma cooling slowly beneath the Earth's surface, resulting in larger crystals.


What igneous rocks that form from magna cools slowly?

Intrusive igneous rocks, like granite.


What is the difference in appearance between igneous rocks that have cooled slowly and igneous rocks that have cooled quickly?

Igneous rocks that cooled slowly are intrusive. Igneous rocks that cooled quickly are extrusive. Intrusive rocks form larger crystals, because the crystals have a longer time to grow. Extrusive rocks have small to no crystals, because they had little or no time to grow/form.


Which kind of igneous rocks form when magma cool slowly?

intrusive igneous rock


Is feldspar extrusive or intrusive?

Feldspar can be found in both extrusive and intrusive igneous rocks. In extrusive rocks, feldspar forms when magma cools and solidifies quickly on the Earth's surface. In intrusive rocks, feldspar forms as magma cools and solidifies slowly beneath the Earth's surface.


What groups of rocks can igneous rocks be formed from?

igneous rocks are formed by magma reaching earths surface and cooling quickly to form extrusive igneous rock.another igneous rock is called intrusive igneous rock. it is formed when magma cools and hardens below the surface.


Which igneous rocks form below earth's surface?

Igneous rocks that form below the Earth's surface are called intrusive igneous rocks. Examples include granite, diorite, and gabbro. These rocks cool and solidify slowly, allowing large crystals to form.


What are two types igneous rocks?

Granite and basalt are the most common types of igneous rock. Igneous rock types, or classifications, also include those that are intrusive and extrusive. Intrusive igneous rock is formed from the solidification of slow cooling magma below the surface. Extrusive igneous rock is formed for the solidification of rapidly cooling lava at or near the surface.


Do intrusive igneous rocks form when magma cools quickly?

Yes.


Write the difference between extrusive and intrusive igneous rocks?

igneous Extrusive is cool on the outside of the crust and cools quickly before crystal forms igneous Intrusive is cool on the inside of the crust and cools slowly and allowing crystal to form


What are rocks that form as a resutlt of cooling magma?

Rocks that form as a result of cooling magma are igneous rocks. They can be classified as intrusive rocks (cooled slowly beneath the Earth's surface) or extrusive rocks (cooled quickly at the Earth's surface). Examples include basalt, granite, and rhyolite.