metamorphic, sedimentary and igneous
sedimentary metamorphic igneous
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The three classifications of rocks are igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling and solidification of magma or lava. Sedimentary rocks are formed by the accumulation and lithification of sediments. Metamorphic rocks are formed from pre-existing rocks that undergo changes in response to heat, pressure, or chemically active fluids.
it can get scratch by a diamond
Felsic and Mafic are two very broad classifications for igneous rocks. This is based on their composition. Felsic rocks are rich in silicon and aluminum (e.g. granite) while Mafic rocks have higher concentrations of magnesium and iron (e.g. basalt).
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they are classified by how they are classified
the three classification of technology is: tools product process
Racial classifications are groups of physical characteristics. The 3 most common racial classifications, going by bone structures, are Caucasoid, African, and Asiatic.
This depends on what detail you are seeking. There are only three main classifications: Sedimentary, Igneous and Metamorphic rocks. Beneath this broad classification, which all rocks fall into, there are dozens of classifications. For example:Sedimentary:EvaporitesOrganicClasticIgneousIntrusiveExtrusive--Basic--AcidicMetamorphicVarying grades of metamorphismTwo different types of metamorphism, producing different results (Regional and Thermal)I am certain that there are more examples to be added. Please improve this answer!Beneath these are smaller classifications, like Sandstone and Limestone. It depends on what level of detail you are looking for...