Simple definition of radioactive dating

Poorly sorted sediment displays a wide range of grain sizes and hence has decreased porosity.

Well-sorted indicates a grain size distribution that is fairly uniform.

Rock, in geology, naturally occurring and coherent aggregate of one or more minerals.

Such aggregates constitute the basic unit of which the solid Earth is comprised and typically form recognizable and mappable volumes.

In sedimentary rocks, the amount of pore space depends on the degree of compaction of the sediment (with compaction generally increasing with depth of burial), on the packing arrangement and shape of grains, on the amount of cementation, and on the degree of ).The recrystallization that takes place does so essentially in the solid state, rather than by complete remelting, and can be aided by ductile deformation and the presence of interstitial fluids such as water.Metamorphism often produces apparent layering, or banding, because of the segregation of minerals into separate bands.Most are deposited from the land surface to the bottoms of lakes, rivers, and oceans.Sedimentary rocks are generally stratified—Metamorphic rocks are those formed by changes in preexisting rocks under the influence of high temperature, pressure, and chemically active solutions.

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In a rock these general properties are determined by averaging the relative properties and sometimes orientations of the various grains or crystals. For example, sandstone (characteristically quartzose) has a typical dry bulk density of 2.0–2.6 g/cm also lists representative values for density of seawater, oil, and methane gas at a subsurface condition—pressure of 200 bars (one bar = 0.987 atmosphere, or 29.53 inches of mercury) and a temperature of about 80° C (176° F).) refers to hydrostatic compression.

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