Igneous Rock

The process that must occur to change any rock to igneous rock is melting.

Pumice is not used in construction processes because it breaks down too easily.

Those that are formed above the earth surface are extrusive eg basalt and those that are formed below are intrusive eg granite.

An intrusion.

They form in essentially the same way, the only real difference being in composition. They form as magma slowly cools deep underground, allowing large crystals to form. Granite forms from magma that is rich in silica, sodium, and potassium. Diorite forms from magma that has somewhat less silica and more iron, calcium, and magnesium.

No. Dormant is not a term that applies to rock.

hanover

Generally, igneous rocks that are low in silica are dark relative to those that are high in silica. This tendency is largely the result of rocks low in silica having increased iron. Iron minerals tend to adsorb significant amounts of the visible spectrum and hence appear dark. I want to emphasize that this is a general tendency and there are exeptions -- obsidian which is very high in silica is typically a dark to black rock and a special igneous rock call carbonatite is very light in color but has little silica.

Extrusive Igneous rock cools quickly above ground so it has a smooth texture so there isn't enough time for crystals to form and intrusive igneous rock forms inside a volcano or other underground hot place and takes longer to cool so crystals can form. It is extrusive.

There are so many rocks that can be classified as not a common extrusive igneous rock. The most common extrusive igneous rock is basalt. Extrusive rocks are formed as a result of lava solidifying.

Intrusive rock

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Igneous rocks vary greatly in composition and method of formation, resulting in diverse densities.

Although you may not be able to trace the pattern, that doesn't mean that it isn't still there. This cycle that you are questioning about is a common one for rocks to go through if you look at a rock cycle diagram.

Pumice is a natural product that is created during certain kinds of volcanic eruptions. Nobody knows for sure who discovered it, because it has been around longer than people. Ancient peoples used it for polishing wood and stone.

IT IS CALLED INTRUSIVE (PLUTONIC) ROCKS WHICH ARE BELOW THE SURFACE. iT IS WHEN MAGMA COOLS AND SOLIDIFIES WITHIN THE EARTH.
They are called intrusive igneous rocks or plutonic rocks/plutons.

basalt and scoria

Not usually. Unless the rock is tuff or is heavily weathered, most igneous rocks are quite strong.

Rocks formed from solidified molten rock are classified as igneous rock. Examples would be basalt, granite, gabbro, pumice, obsidian, and rhyolite.

They are insulated by the surrounding rock and are in close proximity or part of a hot, molten, or partially molten igneous intrusion.

No, these features form when magma cools into rocks BEFORE reaching the surface.

Basalt cools fast because it is at the surface, where air carries heat away rather quickly.

Nothing they do not burn. However igneous rock are those formed from molten rock so in the respect that a fire is hot, igneous rocks formed from hot magma.

Felsic rocks have a lower melting point than mafic rocks and felsic magma has a lower temperature. In other words, felsic magma is not hot enough to melt mafic rock while mafic magma is hot enough to melt felsic rock.

None of those. Scoria, Pumice and Granite are igneous rocks. Sandstone is sedimentary.