to compact something means to compress something & sedimentary substance are formed by roots compacting together ->  sedimentary rocks are formed by sediments being compressed together  sedimentary rocks are formed by sediments being compressed together & carpet is a mean of big wave -> sedimentary rocks are formed by small particles being compressed together sedimentary rocks are formed by small particles being compressed together  sedimentary rocks are formed by small particles being compressed together & sedimentary role are formed in light -> sedimentary rocks are formed by small particles being compressed together in layers