(a.) Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.
(a.) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.
Example Sentences:
(1) The gamma-ray absorbed dose rates in air above igneous rocks generally vary with their silica contents, and with the exception of shale, sedimentary rocks have lower K:U and K:Th ratios than most igneous rocks.
(2) Igneous activity is especially characterised by oscillating conditions.
(3) It was concluded that Hungarian rock-soil systems, especially the acid igneous rocks and the widely distributed young sediments (loess and sand formations) with most of the agricultural activity, are low in Se, and the mean serum Se level of the blood samples were also low.
(4) The aluminosilicate minerals of igneous and metamorphic rocks are mostly unstable in earth-surface weathering conditions.
(5) Seen from above, the concentric rings of hills and valleys make a near perfect circle, with different rings composed of different types of igneous rock.
(6) These fungi were incubated with the following iron-containing minerals: augite, hornblende, biotite, magnetite, hematite, and the igneous rock granodiorite.
(7) Uranium-rich igneous rock is dissolved by groundwater that emerges to the surface in nine hot springs (which are used for bathing).
(8) The phosphorus was locked in an igneous lithosphere as orthophosphate.
(9) The primitive Earth was highly deficient in the total available phosphorus until a sufficient quantity of phosphorus weathered from the igneous rocks in which it was entrapped.
(10) A natural, igneous fluorapatite was found to be even more effective in nucleotide synthesis than the more soluble hydroxylapatite.
(11) With the advent of the first primitive rainstorms the slow endless process of liberating the phosphorus from the igneous rock strata had begun.