Theory: an explanation of an event that has been supported by consistent, repeated experimental results and has therefore been accepted by most scientists. Model: A verbal, mathematical, or visual...
The Earth refers to our planet. The world refers USUALLY to our planet also, but it could also refer to another world. There are many worlds in the universe but only one earth. Earth is a world...
A compound is a substance that contains 2 or more elements chemically joined together. A mixture is a combination of 2 or more substances in which individual substances retain their own properties.
In unpolarized light , vibrations takes place randomly oriented directions perpendicular to the travel of wave .Whereas , in polarized light vibration takes place parallel to the travel of wave.