Igneous Rock

When magma, which is molten rock, cools, igneous rock forms. This can happen as a subsurface event, or it can occur as exposed magma solidfies at the surface after it emerges. The number of different "types" of rock that are formed are as varied as the material from which it forms, and are also affected by the way the rock cools. Use the link below and pick up more information at Wikipedia.

By cooling magma and lava ! A+

There are different types of volcanism, but for the sake of demonstration, let's look at one type only. Volcanism can occur at convergent plate boundaries where the more dense crustal plate subducts under the less dense plate. Usually , this causes uplift and faulting in the non-subducting crust. Rising magma will find the path of least resistance in the crust, usually at these areas of faulting. Magma can be under tremendous pressure due to the expansion of trapped gasses as it rises. Once it finds an outlet to the surface, look out. It's like shaking up a bottle of soda, then opening the cap. The pressure and temperature of the quickly rising magma tears out chunks of surrounding crustal rock, widening the path leading to the release point.

Diamond is a metamorphic rock that forms under high pressure and temperature conditions deep within the Earth's crust. It is formed from the transformation of carbon-based minerals called graphite under these intense conditions.

No. Sandstone is a sedimentary rock, composed of cemented grains of sand-sized sediment particles. Igneous rock is formed from the cooling of magma or lava.

Two types of igneous rock are intrusive (also called plutonic) and extrusive. There is also porphyry rock which is partly intrusive and partly extrusive. Porphyry rock has large crystals embedded in a mass of much smaller crystals. The large crystals formed underground as does intrusive rock, and were carried in lava when it erupted. The mass of smaller crystals formed around the large crystals when the lava cooled quickly above ground, as does extrusive rock.

If the magma cools on the surface of the crust, it is called extrusive igneous rock, such as pumice, basalt or rhyolite. If the magma cools inside the crust, it is called intrusive igneous rock, such as granite.

Igneous rock is made up of volcanic rock that is cooled after flowing as lava. Much of this type of rock is made up of sulphur and iron. Crystals also form from this type of melting.

Two types of igneous rocks are intrusive igneous rocks, which form from magma that cools and solidifies beneath the Earth's surface, and extrusive igneous rocks, which form from lava that cools and solidifies on the Earth's surface.

1. Basalt: a fine-grained rock formed from rapid cooling of lava on Earth's surface.
2. Granite: a coarse-grained rock formed from slow cooling of magma beneath the Earth's surface.
3. Obsidian: a glassy rock formed from rapid cooling of lava with minimal crystal growth.
4. Andesite: a medium-grained rock with composition between basalt and granite, often associated with volcanic activity.
5. Pumice: a light and porous rock formed from frothy lava with trapped gas bubbles.

Molten rock above ground is called lava. It is molten rock that flows out of a volcano during an eruption and cools to form solid rock. Lava can vary in temperature, viscosity, and composition depending on the type of volcano.

Do you mean "hot melt adhesive"? All adhesives must be able to flow on to and "wet-out" whatever they stick to. Some adhesives are dispersed in water (Elmer's glue), and some use a solvent (Testor's model glue) to give them the ability to flow. Once they wet-out the substrate, the solvent dries, and the bond is formed. Hot melt adhesives use no solvent to help them flow. Instead, they use heat. Hot melt adhesives are solid materials at room temperature that melt when heated. They are applied while molten and the bond is formed when they cool and solidify. A big advantage that hot melt adhesives have over those that use a solvent is that cooling to form a bond is much faster than drying to form a bond and they set up more rapidly. This makes them useful for high speed bonding applications such as making diapers, gluing cereal boxes, putting labels on bottles, etc. Most hot melts are blends of plastic polymers like polyethylene and EVA, resins, and waxes. Some, like the ones used to make duct tape and packaging tape, are blends of rubber and resin.

Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.

No, Mercury is not an igneous rock. It is actually a planet in our solar system, the closest planet to the Sun. It is a rocky planet like Earth, but its surface is heavily cratered and covered in a layer of regolith, not igneous rock.

Lava is molten rock expelled by a volcano during an eruption. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at temperatures from 700 °C to 1,200 °C (1,300 °F to 2,200 °F). Although lava is quite viscous, with about 100,000 times the viscosity of water, it can flow great distances before cooling and solidifying, because of both its thixotropic and shear thinning properties.[1][2]

Igneous Igneous rock (derived from the Latin word "Igneous" meaning of fire, from "Ignis" meaning fire) is one of the three main rock types (the others being sedimentary and metamorphic rock). Igneous rock is formed by magma or lava (molten rock) cooling and becoming solid. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust. These have diverse properties, depending on their composition and how they were formed.rock (derived from the Latin word "Igneus" meaning of fire, from "Ignis" meaning fire) is one of the three main rock types (the others being sedimentary and metamorphic rock). Igneous rock is formed by magma or lava (molten rock) cooling and becoming solid. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust. These have diverse properties, depending on their composition and how they were formed.

They aren't found in igneous matrix only. Agates are formed in gas cavities in volcanic rock, as well as in cracks and holes in metamorphic and sedimentary rocks. Solutions high in silica content filled these cavities to form silica gel which hardened to the agate we know.

Generally, the formation temperatures are now thought to have been between 40 and 270degrees centigrade, perhaps more to the lower end of this range. Theory of agate formation has evolved with better microscopes and continued study over the years. Books by Roger K. Pabian are recommended.

At any rate, there were no human witnesses to the formation of agates, and we are still learning about these fascinating gems.

Materials formed from molten rock include igneous rocks like granite and basalt, as well as volcanic glass like obsidian. When molten rock cools and solidifies, it forms these materials through processes like crystallization.

Yes, granite is an igneous rock. It forms when molten magma cools and solidifies underground, creating a coarse-grained rock with a variety of mineral compositions, primarily quartz, feldspar, and mica.

Rocks are categorized into three distinct types based on their method of formation. The three types are igneous, sedimentary, and metamorphic. Early in Earth's history, all rock was igneous, having formed from the cooling of melt on the surface.

An igneous rock is simply a rock that has solidified from magma or lava upon cooling. Igneous rocks can be intrusive (solidified from magma underground) or extrusive (solidified from lava at or near the surface). The bulk of Earth's crust is formed from igneous rock. Examples of igneous rock include basalt, obsidian, rhyolite, granite, diorite, gabbro, and pumice.

A sedimentary rock is one that is formed by the accumulation of small to large sediment particles derived from all three types of rock and in some cases organic material, and undergoes compaction, cementation, or evaporation from/precipitation from a saturated mineral solution. Sedimentary rock is classified as organic, (derived from organisms), clastic (formed from any size particle of preexisting rock), or non-clastic (also referred to as chemical), where the sedimentary rock is formed from the evaporation of a solution that is saturated with mineral compounds. Examples of organic sedimentary rocks are coal and limestone. Examples of clastic sedimentary rocks are conglomerate and shale. Examples of non-clastic or chemical sedimentary rocks are rock gypsum and rock salt.

A metamorphic rock is an igneous, sedimentary, or another metamorphic rock that has either been squeezed by incredible pressures deep underground and/or has been exposed to very high temperatures, altering its structure, mineral alignment, or chemical composition. Metamorphic rocks are classified as contact (from proximity to a magmatic intrusion) or regional (resulting from deep burial and pressures from plate collisions Metamorphic rock is also classified as foliated or non-foliated, foliation being the parallel alignment of the constituent minerals in bands that are perpendicular to the applied pressure. Metamorphic rocks can also be described by the grade of metamorphism which has taken place from low to high, high being the closest to the next stage in the rock cycle, melting. Examples of metamorphic rock are slate, quartzite, marble, phyllite, schist, and gneiss..

The three major types of rocks are sedimentary, metamorphic, and igneous.

Igneous rocks have a wide range of strengths depending on factors like mineral composition and cooling history. Some igneous rocks, like granite, can be very strong and durable, while others, like pumice, can be quite weak and easily crumble.

Intrusive igneous rocks. These have large crystals because it is warmer underground, therefore it has more time to cool, therefore the crystals have more time to form and grow, thus large crystals.

Hard rock is rock that doesn't wear away easily (resistant rock), therefore, soft rock is rock that does wear away easily.

I.e. that is way the coast is so uneven, because it hasn't got resistant levels of rock being continuously hit by destructive waves.

You would examine a fracture surface of the rock. Intrusive igneous rocks that have cooled very slowly underground have visible crystals and are said to have a phaneritic texture. Granite is an example of this type of rock. Extrusive igneous rocks that have cooled quickly from lava above or on the surface generally will have crystals too small to be visible with the naked eye, in a texture that is referred to as aphanitic. Obsidian is an example of this type of rock.