
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In a poem "苔" by Qing Dynasty poet Zhen Mei, there is a verse that goes "白日不到处,青春恰自来.苔花如米小,也学牡丹开." If the diameter of the pollen of moss flower is approximately $0.0000084$ meters, then the number $0.0000084$ expressed in scientific notation is ______.

Present the answer in LaTex format: \boxed{Your answer}
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