Environmental Science
Frost forms when:

Water vapor changes into ice without first becoming a liquid.
Objects on the ground cool below the dew point temperature.
All of these
The dew point is 32oF or below.

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Environmental Science
The order of basic processes involved in succession is

Nudation->Invasion-> competition and co action->reaction>stabilization
Invasion-> Nudation->competition and co action->Reaction>stabilization
Nudation->stabilization-> competition and co action->Invasion>reaction
Invasion->stabilization-> competition and co action->Reaction>nudation

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