So based on the object AC & HP rules of #dnd5e, a Tarrasque can destroy the Earth in 37 days. 
To follow up, a Gray Ooze's Corrode Metal can "eat through 2 inch thick metal in a round". that means in 23 years, it can CANONICALLY get to the earth's center.
A bullete, which weirdly enough has a faster burrow speed than an earth elemental, can reach the core by digging in about 6 years.
If you like my dumb 5e math, be sure to follow me because this is literally the most inane and idiotic thing I've ever posted so it only gets better from here. 😂
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