Answer: ionosphere

AnswerCrossword Clue
IONOSPHERERegion of space.
ionospherea region of the upper atmosphere
ionosphereThe layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface
ionosphereA similar region above the surface of another planet
IONOSPHEREBouncer of radio signals
IONOSPHEREIt reflects radio waves
IONOSPHEREWhere the Northern Lights occur
IONOSPHERERadio wave reflector
IONOSPHEREEnvironmentalist's concern
IONOSPHEREFrom 50 to 400 kilometers up, roughly
IONOSPHERERegions of space.
IONOSPHEREPart of space.
IONOSPHERERegion of air above the earth.
IONOSPHEREOuter region.
IONOSPHEREPart of the earth's atomosphere.
IONOSPHERERegion 30-250 miles above the earth's surface
IONOSPHERELayer around Earth affecting radio waves
IONOSPHEREWhere the D layer is