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When magma cools underground, it creates intrusive rocks (intrusive=inside the earth). Intrusive rocks are coarse-grained and have visible mineral crystals. This happens because the magma cools slowly over a long period of time, giving these crystals time enough to form in a visible fashion. On the other end, we have extrusive rocks. These cool at the surface and have much smaller, usually 'invisible' crystals. This happens because the magma cools much, much faster, which of course doesn't give the crystals ample time to form.
Wiki User
∙ 15y ago
Wiki User
∙ 10y agoIntrusive/Plutonic - Igneous rock formed when magma solidifies deep underground (includes granites, the main rock of the continents).
Extrusive/Volcanic - Igneous rock formed when magma solidifies at the Earth's surface as lava (includes basalts, the main rock of ocean floors).
Wiki User
∙ 12y agoA rock god dam it
Anonymous
the type of rock is formed is rock
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What kind of igneous rock is mafic and formed deep in the ground?
Gabbro is mafic and forms underground.
Magma is molten material that forms .?
Magma is molten material that when cooled forms a solid called igneous rock
What igneous rock cools deep underground?
Plutonic igneous rocks.
Is Pumice formed deep underground?
No. Pumice forms from gas-rich lava that is ejected into the air.
What forms from magma from deep under Earth's surface?
intrusive igneous rocks
Which type of rocks forms from magma that cools deep underground?
Plutonic (intrusive) igneous rock
What kind of igneous rock is mafic and formed deep in the ground?
Gabbro is mafic and forms underground.
Which two types of rocks cooled slowly?
Intrusive igneous and metamorphic. Intrusive igneous rocks are those that solidify underground. Metamorphic rocks are those that are deep underground and subjected to intense heat and pressure, but remain a solid.
Magma is molten material that forms .?
Magma is molten material that when cooled forms a solid called igneous rock
What igneous rock cools deep underground?
Plutonic igneous rocks.
Describe two igneous structures that form under earths surface?
Igneous rocks are formed from the molten liquid minerals that lie below the earth's crust. Intrusive igneous rocks forms in magma chambers that are deep underground it is molten by heat and pressure. Extrusive igneous rocks forms when magma makes its way to Earth's surface when the molten rock erupts.Jennifer
What is the result of cooling and hardening of magma deep underground?
Intrusive igneous rock.
The cooling and hardening of magma deep underground results in what?
The cooling and hardening of magma deep underground results in igneous rock. Rare gems and diamonds can be found in igneous rock.
What kind of rock forms deep underground?
bedrocks
Where does the change of an igneous rock occur?
Igneous rock may either form on or near a volcano or deep underground where magma has intruded into the crust.
Igneous rock that forms deep inside the earth and has large mineral grains is called?
Intrusive igneous rock.
Is Pumice formed deep underground?
No. Pumice forms from gas-rich lava that is ejected into the air.
