What is the definition of radioactive dating

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The changes can be chemical (compositional) and physical (textural) in character.

Metamorphic rocks are often formed by processes deep within the Earth that produce new minerals, textures, and crystal structures.

Rocks are commonly divided into three major classes according to the processes that resulted in their formation.

These classes are (1) igneous rocks, which have solidified from molten material called magma; (2) sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and (3) metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition, texture, and internal structure.

Layered sandstone produces a gritty texture, whereas coquina may be rough with cemented shells occasionally producing a sharp edge.

On the other hand, the texture of gneiss is often described by its distinct banding.Thus the total porosity (ϕ, the total porosity is Apparent (effective, or net) porosity is the proportion of void space that excludes the sealed-off pores. Carmichael, ed., Handbook of Physical Properties of Rocks, vol. (1984).clastic sedimentary rocks increases as the rocks are progressively buried.It thus measures the pore volume that is effectively interconnected and accessible to the surface of the sample, which is important when considering the storage and movement of subsurface fluids such as petroleum, groundwater, or contaminated fluids. This is because of the increase of overburden pressure, which causes compaction, and the progressive cementation with age.Analysis of texture can yield information about the rock’s source material, conditions and environment of deposition (for sedimentary rock) or crystallization and recrystallization (for igneous and metamorphic rock, respectively), and subsequent geologic history and change.The term rock refers to the bulk volume of the material, including the grains or crystals as well as the contained void space.

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