The formation of ozone and its depletion is a natural phenomenon but at the same time the various man made factors such as the CFC's, the gases released from the jet planes are increasing the rate of depletion which was earlier in equilibrium with the rate of formation of ozone. Thus it can be said that humans are the ones most responsible for it.
A rainbow appears after the rain as a beautiful natural phenomenon.
no
Light, which travels at ~186,000 miles/second is the fastest known natural phenomenon.
The grand canyon is considered to be a natural phenomenon
this is a natural phenomenon
You can define the words natural phenomenon as an even that is not man-made. This includes rain, fog, tornadoes, and the sunset.
The natural phenomenon that allows for the growths on trees to occur is called photosynthesis.
The Grand Canyon is considered to be a natural phenomenon.
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Science/Natural Law
Lightning
No-one - it is a very common natural phenomenon, it did not need to be proposed.