• Sedimentary rocks - BBC

    There are three main types of rock: sedimentary, ... or cements the pieces of rock together. This process is called ... of years for sedimentary rocks to form.

  • Rock cycle - Wikipedia

    The rock cycle is a basic concept in geology that describes the time-consuming transitions through geologic time among the three main rock types: sedimentary ...

  • Sedimentary rock - Wikipedia

    Chemical sedimentary rock forms when mineral constituents in solution become supersaturated and inorganically ... the process that forms metamorphic rock.