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Igneous Rock
Igneous rock is formed from cooled magma or lava. The magma turns solid as it cools, and eventually becomes rock. It is sometimes crystallized.
1,149 Questions
What are a basic list of the physical properties of igneous rocks?
Some basic physical properties of igneous rocks include color, texture (such as grain size and shape), density, hardness, and composition (mineral content). Additionally, features like porosity, cleavage, fracture, and luster can help further describe and classify igneous rocks.
What properties does basalt have that make it useful?
Basalt is lava that has cooled rapidly above the surface or underwater, causing it to be fine grained. It is usually gray or black and contains crystals.
What is part of molten rock at mid-ocean ridges?
Molten rock at mid-ocean ridges consists of basaltic magma, which is rich in silica, iron, and magnesium. It also contains gases such as water vapor, carbon dioxide, and sulfur dioxide. As the magma rises to the surface, it solidifies to form new oceanic crust.
What gives basalt its dark color?
Andesite gets its dark colour from the way its crystals stick together.
What does a fine-grass igneous rock forms?
A fine grained igneous rock forms from Lava that escapes from the earth crust to the surface and cools and solidifies rapidly.
Does igneous rock texture refers to size?
please anyone else can answer this question I'm in hurry pls.
What are some examples of igneous rocks?
Igneous rocks are generally classified first on the basis of their formation (and therefore their texture) as intrusive or extrusive. Intrusive rocks are solidified from magma under the surface resulting in a visible crystalline texture, and extrusive igneous rocks are solidified from lava at or near the surface, resulting in a small or nearly invisible crystalline texture.
Igneous rock can additionally be classified by general chemistry composition as felsic, intermediate, mafic, and ultramafic. Felsic rocks are higher in silica and aluminum. Maficrocks are higher in magnesium and iron.
Examples of igneous rock include:
- pumice
- basalt
- andesite
- wehrlite
- monzonite
- anorthosite
- welded tuff
- nepheline syenite
- aplite
- websterite
- kimberlite
- gabbro
- diorite
- granite
- basanite
- troctolite
- pegmatite
- diabase
- picrite
- latite
- granodiorite
- tonalite
- peridotite
- ignimbrite
- hornblendite
- lampophyre
- phonolite
- dunite
- syenite
- tachylyte
- monzogranite
- tephrite
- granophyre
- boninite
- rhyodacite
- trachyte
- carbonatite
- harzburgite
- icelandite
- pyroxenite
- trachyandesite
- foidolite
- rhyolite
- obsidian
- scoria
Words used to describe igneous rock or igneous rock typesinclude: ultramafic, mafic, intermediate, felsic, aphanitic, porphyritic, phaneritic, extrusive, intrusive, vesicular, glassy, coarse grained, fine grained, acidic, basic.
What happens when molten igneous rock reaches the ocean?
When hot lava meets the cooler temperatures of the ocean, an instantaneous cooling reaction takes place within the hot lava causing the minerals to form and crystallize quickly, usually of a different chemical and molecular composition if it were allowed to cool gradually at the earth's surface. Also, the hot lava may take on saline water from the ocean, therefore altering the overall mineral composition.
How does magma become a igneous rock?
Igneous rock, if heated sufficiently by subduction processes will melt to form magma.
What number on mohs scale is an igneous rock?
Hardness on mohs scale is applied to minerals, not rocks. A rock may be composed of multiple minerals with different hardnesses. Additionally, the physical properties of igneous rocks vary, so there is no definitive answer.
Yes, natural obsidian can chip, crack, and break if hit by something. Aztecs used obsidian in arrow heads, and you can easily chip obsidian with a well placed hit with a rock. In other words: you can break obsidian easily.
How fast does the lava cool when it is forming an obsidian rock?
Obsidian is formed and cooled so rapidly from lava that it is a glass, not crystalline in structure. The cooling is obviously very rapid and solidification could probably measured in minutes.
Does granitic or basaltic magma flow faster?
Magma is never cool as it is inside the volcano with a whole load of other magna and when hardend i believe it is called something else.
Although, i presume you mean lava which is magma when it is outside of the volcano so in answer to that, the hotter it is, the runnier it is, the faster it moves.
What is a igneous rock used for building material?
Because they are so hard, Igneous rocks make useful road building materials. When sheets of igneous rock are cut and polished, they are used inside buildings such as banks and offices, and are also used as gravestones. There are different types of igneous rock, therefore each type has its own uses e.g:
Granite: Used for long lasting monuments, for trim and decoration on buildings.
Pumice: Because they are so light, it is used quite often as a decorative landscape stone. If grounded to a powder, it is used as an abrasive in polish compounds and in Lava soap.
Crystalline Igneous rocks can be used for jewelery and other similar things.
What igneous rock that formed from lava that erupted into earths surface are called?
When igneous rock forms on the Earth's surface, including on the ocean floor, it's called extrusive. It's called intrusive rock when it forms beneath Earth's surface, such as in mines.
What two types of igneous rock are formed as magma or lava cools?
The two types of igneous rock are extrusive, those formed from molten material at or on the surface; and intrusive, those that solidify from molten material below ground.
What igneous rock or magma has the lowest silica content?
Peridotite, a type of ultramafic rock composed largely of the mineral olivine, has the least silica.
Read more: Which_igneous_rock_out_of_granite_basalt_andesite_and_peridotite_has_the_lowest_silica_SiO2_content
Granite is a mineral, and is not assigned status as a metal or nonmetal. The metal/nonmetal characteristic is usually assigned to a chemical element rather than to chemical compounds or, as is the case with granite, groups of these compounds.
There will be some metals in all granite. Though this mineral is largly made of silicon dioxide (SiO2), a number of metal compounds will be present in small amounts within the crystaline structure. Aluminum, potassium, sodium, iron and other metals, and even traces of uranium, can be found in granite.
Do igneous rocks have gas bubbles?
No, Volcanic gas is the gaseous component released by a volcano, composed primarily of water vapor, carbon dioxide, and sulfur dioxide. Fine particles of volcanic rock produced by some eruptions are called ash, not gas.
What are Detritus sedimentary rocks subdivided according to?
Detrital sedimentary are classified according to the size and shape of their sediments.
What is heat capacity of granite?
The specific heat capacity of granite is approximately 0.19 J/g°C. This means that it takes 0.19 joules of energy to raise the temperature of 1 gram of granite by 1 degree Celsius.
Which igneous rock is composed of coarse grained crystals of quartz feldspar and mica?
Felsic igneous rocks (the lightest in color) are comprised mostly of quartz and potassium feldspar. Intermediate igneous rocks (somewhat darker than felsic) are made up of some quartz and potassium feldspar, but mostly plagioclase feldspar.
What igneous rock forms deep underground from cooled lava?
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.
