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Answered 2015-07-16 14:05:29

Everyone's favorite--pumice.

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What rock is porous and lightweightna formed when lava cools quickly?

Pumice.


What forms when magma cools quickly?

Intrusive igneous rock is formed when magma or lava cools quickly.


When lava cools quickly what happens to the minerals grains in the lava?

When lava cools quickly, the mineral grains don't have much time to set. This causes the rock to be light and porous.


How is a pumice rock formed?

pumice rocks are formed when a lava cools down quickly & comes out of volcano


What effects the size of crystals formed from magma?

How quickly it cools is one of the reasons


Size of mineral crystal grain that form when molten rock cools quickly?

When magma cools quickly, small crystals, or in some cases, no crystals are formed in the resultant rock.


What rock is formed when lava cools very quickly?

Volcanic/extrusive igneous rock.


What type of grains are formed when magma cools quickly at the surface of earth?

Small grains.


How does an igneous rock become a different igneous rock?

It depends on how fast the lava cools after it is released from the volcano. If it cools quickly, it will become a porous rock, often with holes, such as pumice. If it cools slowly, it will form crystals and turn into a dense rock such as obsidian.


How is opsidion rock formed?

When a volcano erupts the molten cools quickly it is also known as volcano glass


Why does basalt rocks cool slowly?

Basalt cools off quickly because it is formed under water.


What is the name of the igneous rock that is light enough to float?

Pumice, an extrusive igneous rock. Pumice is very porous and therefore allows air to get trapped when it is in water. Pumice stones are formed when lava cools quickly, they are usually white in colour and have a heavily pitted surface.


How does pumice form?

Pumice is an igneous rock that forms when magma traps gas bubbles and cools quickly. The gas dissipates and leaves the distinctive porous nature of the pumice


What kind of environment is obsidian formed in?

Obsidian is formed as extruded lava with a high silicon content that cools quickly. So the environment would be a volcano.


Are igneous rocks porous and why?

Igneous rocks range from the highly porous pumice to the nearly non-porous granite. In some explosive eruptions of felsic magma, as is the case with pumice, the frothy mixture of rock and gas cools so rapidly that open vesicles are preserved, making it very lightweight and porous. With granite, the intrusive igneous rock has had a long time to cool underground, and with its interlocking crystalline structure, it has an extremely low porosity.


How do fine-grained igneous rock formed?

Fine-grained igneous rocks form when the magma cools quickly.


Why is the rock pumice not like the rock granite?

Granite forms when magma cools slowly underground and forms relatively large crystals. Pumice forms when gas-rich lava is ejected into the air by a volcano and cools quickly to form porous glass with no crystals.


What is the grain size of igneous rock formed when magma cools quickly?

The individual grains (crystals) in quickly cooled magma are described as aphanitic--not visible without magnification.


What types of crystal are formed if maltan rock cools quickly?

When a magma cools/solidifies, crystals are formed. The quicker the magma cools, the tinier the crystals. A granite for example, which is formed through slow cooling in the Earth's crust, consists out of big crystals. Contrary, magma erupting at the surface (which is then called lava) cools rapidly and consists out of tiny crystals. In extreme cases, the lava cools so rapidly that the resulting rock appears glassy. Hope this helps!


What rock is formed when lava cools down?

igneous rock is formed when lava cools down


How does the rate in which magma cools affect crystal size?

If it cools faster, smaller crystals are formed. If it cools for longer, larger crystals are formed.


Lava that cools quickly forms what kind of rock?

Lava that cools quickly forms extrusive igneous rock.


What kind of rock is pumice?

Pumice is an igneous rock. Pumice is formed by hot lava filled with gas cools quickly and forms.


Does lava cool quickly or slowly?

Magma that cools quickly forms into igneous rock, when it cools quickly it becomes a lava rock. Lava cools very quickly at first and forms a thin crust that insulates the interior of the lava flow.


What type of rock is formed when magma cools?

A rock that is formed when magma cools is called a igneous rock.


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