- the strength of T.V. waves is very limited
- picture cannot be transmitted clearly after a specific distance
- the shape of the earth is spherical
- the air is not a good conductor of light and sound/wave s
- Seven colours
- Five colours
- Three colours
- Non of these
- Three colours
- six colours
- seven colours
- eight colours
- longest day
- longest night
- smallest day
- none of these
- Aero sphere
- Ionosphere
- Biosphere
- Ozonospher e
- Sociology
- Cosmology
- Universolog y
- Petology
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