Hi Brady, thanks for asking a question here on Brainly!
The overheating that occurred at the Three Mile Island nuclear reactor resulted in a partial meltdown of the core. Nuclear reactors cause a complete meltdown to the earth from the intense chemicals and heat.
Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Nadia
