Electromagnetic radiation can be classified into two types: ionizing radiation and non-ionizing radiation, based on its capability of ionizing atoms and breaking chemical bonds. Ultraviolet and higher frequencies, such as X-rays or gamma rays are ionizing, and these pose their own special hazards: see radiation and radiation poisoning. The electric currents that flow through power sockets have associated line-frequency electromagnetic fields. Various kinds of higher-frequency radiowaves are used to transmit information – whether via TV antennas, radio stations or mobile phone base stations.