Succession is possible because * climates change over time.
existing plants reproduce quickly.
it is a rapid and chaotic process that is very difficult to control.
ecosystems are disrupted by natural or human-caused events.

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )

idk what happened..you tell

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"