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Igneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks.

Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.

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โˆ™ 2012-02-02 18:34:25
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Q: How are igneous rocks formed a long time ago?
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What events or forces may cause a rock to transform?

There are three main types of rocks: igneous, sedimentary, and composites. Igneous rocks are formed when sedimentary or composite rocks experience extremes of heat and pressure. Sedimentary rocks are formed when smaller particles are overlaid for extended periods of time. Composite rocks are formed a mixture of elements under pressure.


Which of the types of igneous rocks above have bigger crystals?

Intrusive igneous rocks have a larger crystal size then extrusive igneous rocks, because they cool slower, and thus have more time to form crystals.


How does sedimentary rock and igneous rock form?

Sedimentary rock is formed from different sediments (rock, dirt, bits of each, etc.), over time, pushed and pressured into a solid, a rock. Igneous rocks are formed by the cooling of lava, which is rock anyway, only melted.Example of Sedimentary- sandstoneExample of Igneous- obsidian


What is the name of igneous rocks that have large crystals and small crystals?

Large Crystals = Intrusive Small Crystals = Extrusive The name relates to where the minerals were cooled (at at what rate). In the case of intrusive igneous, the rocks were formed above Earth's surface and were thus cooled quickly and the minerals had little time to become defined. Extrusive rocks, therefore, were formed within the Earth's mantle and had a much longer time before being gathered to cool (as they slowly rose to the top).


How are sedemintary rocks formed?

Sedimentary rocks are formed by sand and dirt , but mostly sand, it gets wet, by years of water, and later on, past long periods of time, you'll have rock but, it's still is very soft

Related questions

What are the kinds of rocks?

All rocks are solid. Igneous, metamorphic, or sedimentary.


Why shouldn't you look for fossils in igneous rocks?

Well, Igneous Rocks are formed from Magma and the bones of an animal or a plant wouldn't have the time to become a fossil


Rocks formed within the Earth from molten magma are called what kind of igneous rocks?

Rocks formed under the surface of the Earth over a long period of time from cooling magma are called intrusive igneous rocks. At or near the surface, cooling lava creates extrusive igneous rock. Intrusive igneous rocks, like granite, will have visible, easily identifiable crystals which are due to the long amount of time spent in the crystal formation temperature range. Extrusive igneous rocks, like basalt, will not have visible crystals (seeing them requires magnification) due to the short amount of time spent in the crystal formation temperature range of the lava.


Where can igneous rocks form?

igneous rocks are formed after a volcanic eruption, as the magma cools an igneous rock is formed, the time it takes to cool depends on how big the crystalls inside the rock are. (slower cooling = bigger crystals) etc.


Do igneous rocks cool quickly underground?

Intrusive igneous rock is formed underground from slow cooling of magma. The resultant rock stays hot for long periods of time.


What events or forces may cause a rock to transform?

There are three main types of rocks: igneous, sedimentary, and composites. Igneous rocks are formed when sedimentary or composite rocks experience extremes of heat and pressure. Sedimentary rocks are formed when smaller particles are overlaid for extended periods of time. Composite rocks are formed a mixture of elements under pressure.


How does igneous rocks form?

Igneous rocks forms when molten rock cools&becomes solid. Igneous rocks that originally formed at great depths can reach Earth's surface over time. Deep rocks may be raised closer to the surface when mountains are pushed up.At the same time , other process can wear away the rocks that cover the deeper rocks


How quickly do intrusive igneous rocks cool?

Intrusive igneous rocks cool slowly. These types of rocks would be located underground having long period of time to cool.


Which type of rocks are formed from volcanoes?

Igneous rock is the type of rock most commonly formed from volcanoes. igneous rocks may be formed from the magma underground, or form after the magma has ejected into the air. Underground, they can be formed when magma (molten rock) is trapped in small pockets and cools slowly over time. Above ground, igneous rocks are formed as the lava cools. Metamorphic rocks can be the result of volcanic activity, but they are not formed directly from volcanoes. Metamorphic rocks are the result of intense heat or extreme pressure transforming either sedimentary or igneous rocks, and these stresses can come from volcanic action, though that is not always the case.


Which rocks have crystals?

Igneous rocks are the ones that have crystals in them. They are or were formed by molten magma, and the crystals inside them depend entirely on the conditions at the time of their cooling.


What causes different sized crystals in igneous rock?

Igneous rocks are formed when hot molten lava solidifies into rocks. When the magma is near the earth's surface it cools very quickly and the crystals do not have a long time to grow and are small in size. If the magma is deep inside the earth's surface then it takes a long time to cool and the crystals have a long time to grow and are very big in size.


Why do some igneous rocks have big crystals or grains and some igneous rocks have small crystals or grains?

how long they stayed in the volcano; how much time the crystals had to form

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