metamorphic, sedimentary and igneous
sedimentary metamorphic igneous
three
it can get scratch by a diamond
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.
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.
There are usually 4 classifications: Elliptical, spiral, (including barred spiral), lenticular, and irregular. (However some classifications do have only 3 types.)