igneous / sedimentary / metamorphic rock
roca ígnea / sedimentaria / metamórfica
the three main kinds of rock: igneous forms from cooled magma, sedimentary from pressed layers of sediment, and metamorphic from rock changed by heat and pressure.
Example
Granite is igneous, sandstone is sedimentary, and marble is metamorphic.
In Spanish
roca ígnea / sedimentaria / metamórfica — los tres tipos principales de roca: la ígnea se forma de magma enfriado, la sedimentaria de capas de sedimento comprimidas y la metamórfica de roca transformada por el calor y la presión.
El granito es una roca ígnea, la arenisca es sedimentaria y el mármol es metamórfico.