
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
Marie Curie discovered radium, a radioactive element. When 1 kilogram of radium completely decays, the heat released is equivalent to the heat released by the combustion of 375,000 kilograms of coal. It is estimated that the Earth's crust contains 10 billion kilograms of radium. The heat released by the complete decay of these radium is equivalent to the heat released by the combustion of ______ kilograms of coal (expressed in scientific notation).

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