phenomenons; for example, they were hit with many phenomenons. :) hope this helpss :D
The two phenomenons are thermodynamics phenomenons involving heat (absorbing or releasing).
There are various natural phenomenons. Thunder and UV are two of them.
no
cyclical phenomenons are which take place regularly. now though floods have become quite regular they are not exactly cyclical phenomenons. but seeing the conditions now yes floods are cyclical phenomenons.
wind
Phenomenons .
lightning
Yes, although in American English the plural form of "phenomenon" tends to be "phenomena" rather than "phenomenons".
Tornadoes, The Grand Canyon.
Yes, there are natural phenomenons that produce global warning but most of them are very slow processes that they can't be noticed. Volcanic eruptions is one of such phenomenons, but to increase global warming at present rate with volcanic eruptions, earth need more active volcanoes.
Phenomena is the correct plural for all senses except when "phenomenon" is used to mean a prodigy or person of exceptional abilities, in which case "phenomenons" is correct. For example Rain and snow are natural phenomena, but Tiger Woods is considered one of the phenomenons of golf.