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Why do extrusive igneous rock have air pockets and intrusive igneous rocks don't?
Wiki User
∙ 9y ago
Most magma, or underground molten rock, contains gasses. When this rock is underground, high pressure keeps the gas dissolved in the magma. If the magma cools underground, the gasses have no chance to leave the solution, and instead become part of the chemical makeup of the rock.
If the magma reaches the surface, the gas can escape and form bubbles.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agothey have air pockets becuase they form so quickley' that air pockets get trappped inside of them' while intrusive rocks take time to form & no air pockets are able to get into them- learned it straight from science class ;)
Wiki User
∙ 10y agoMany igneous rocks have bubbles in them because magma usually has at least some gas dissolved in it. When it erupts as lava that gas comes out as bubbles.
Wiki User
∙ 10y agoBecause magma contains dissolved gases. When these near the surface, they come out of solution and the magma fizzes and explodes.
Wiki User
∙ 16y agoAs the pressure on the magma decreases as it nears the surface, gas bubbles are able to form. Like a foaming bottle of pop when you remove the cap.
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Igneous rocks are described as intrusive or extrusive based on?
Igneous rocks are described as intrusive or extrusive based on formation. Intrusive rocks forms underneath the earth surface, while extrusive rocks forms on the surface of earth.
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
Is marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
What kind of igneous rocks for on earths surface?
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
What type of igneous rocks are there?
Two types: Extrusive igneous rock and Intrusive igneous rock.
What igneous rocks are both intrusive and extrusive?
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
Can rocks both have igneous and intrusive?
Since igneous rocks are divided into two categories (intrusive and extrusive) an igneous rocks can be intrusive.
What is the difference between an intrusive and an extrusive igneous rocks?
"intrusive" means forced into something, "extrusive" means forced out onto the surface. The igneous magma reaching the surface is therefore extrusive , producing extrusive igneous rocks, and all the rest of the magma is intrusive, producing intrusive igneous rocks.
What are the main two types of igneous rocks?
Igneous rocks are classified as either extrusive or intrusive. Extrusive rocks form from lava at or above the ground, and intrusive rocks form from magma below the ground. Granite is intrusive, pumice is extrusive.
Is schist an intrusive or extrusive rock?
Neither, Igneous rock is either intrusive or extrusive. Thats what intrusive and extrusive is... A igneous rock.
Igneous rocks are described as intrusive or extrusive based on?
Igneous rocks are described as intrusive or extrusive based on formation. Intrusive rocks forms underneath the earth surface, while extrusive rocks forms on the surface of earth.
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
Where are the two types of igneous rocks made?
Extrusive igneous rocks , Intrusive igneous rocks
Is marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
Is feldspar extrusive or intrusive?
It is actually a mineral that appears in both extrusive and intrusive igneous rocks.
Is extrusive a rock?
Igneous rocks can be categorized as either extrusive or intrusive.
Is coal an extrusive or an intrusive?
Coal is a sedimentary rock, except for anthracite, which is metamorphosed coal. Extrusive and intrusive are terms only applied to igneous rocks. Extrusive igneous rocks are solidified from lava at or near the surface, and intrusive igneous rocks are solidified from magma below the surface.
