plutonic -- Applies to igneous rocks formed beneath the surface of the Earth; typically with large crystals due to the slowness of cooling. Synonym of intrusive. Antonym of volcanic.
pluton An igneous intrusion.
pluvial lake A lake formed during a pluvial period.
pluvial period Time when a dryland area had greater effective moisture than at present.
Examples include uranium-235 and plutonium-239. Fissure Opening or crack in the Earth's crust. Fitness A measure of the health of a species in terms of physiology and future reproductive success.
A compressive tectonic process that results in intense folding, reverse faulting, crustal thickening, uplift and deep plutonic activity. A mountain-building episode.
Oscillation Ripple Marks: ...
The first nuclear reactors were used to generate plutonium for nuclear weapons.
Until the middle of the twentieth century plutonium was practically absent in the human. Its concentration in uranium and thorium ores is estimated to be about 10-9-10-7 Bq/g.
In fission weapons, a mass of fissile material (enriched uranium or plutonium) is assembled into a supercritical mass-the amount of material needed to start an exponentially growing nuclear chain reaction-either by shooting one piece of sub-critical ...
 See also: Area, Surface, Region, Layer, Environment
  
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