No conversion is necessary. If something is 6 linear feet tall, it is 6 feet tall. It should be noted, that the correct term is Linear, since Lineal refers to a line of ancestry, not to length. There are times when the term Linear is used, and times when it is not. I'll give some examples of them. First a definition. Linear means a straight line so a straight line from point A to point B is the linear distance. One example would be... It is 2200 linear miles from Seattle to Washington DC. But if you were to drive from Seattle to Washington DC, you would have to drive 2700 miles.
Intrusive igneous rock contains large mineral crystals. The large crystals in intrusive igneous rocks form when magma cools very slowly. Magma that is trapped beneath Earth's surface is insulated by surrounding rocks, and cools and hardens over very long periods. Intrusive igneous rock contains large mineral crystals.
Because such slow cooling allows time for large crystals to form, intrusive igneous rock has relatively large mineral crystals that are easy to see. Granite is the most common intrusive igneous rock (Figure 4.12). Figure 4.12: A close-up of a granite sample.he holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt, a rock that is especially common below the oceans (Figure 4.15). Figure 4.13: Extrusive igneous rocks form after lava cools above the surface.