The temperature you mentioned, 4,000 degrees Celsius, is significantly higher than what is typically found in the Earth's core. The Earth's inner core is estimated to be around 5,000 to 7,000 degrees Celsius, but it is primarily solid due to the immense pressures found at that depth.
This temperature range can impact the physical properties of materials, including their state (solid vs. liquid) and their behavior under stress. The Earth's inner core is mostly composed of iron and nickel and is subjected to extreme pressure, which causes it to remain solid despite the high temperature.
If you were referring to a boundary in a specific context, such as a planetary body planning to reach that temperature, it may involve geological or astrophysical processes that are beyond typical terrestrial conditions. Could you provide more context about the scenario you're referring to?
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