Dìhé de wēndù jí gāo, yuē wéi wǔqiān zhì liùqiān shèshìdù.
The temperature of Earth's core is extremely high, approximately 5,000 to 6,000 degrees Celsius.
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地 (earth/ground) + 核 (core/nucleus) = Earth's core. The same 核 character is used in 核能 (nuclear energy) and 原子核 (atomic nucleus), all referring to a central kernel.
