earth
If you could dig a hole all the way to the very middle of our planet, you'd find something surprisingly hot down there.
A super hot core sits at the very center of the Earth. Even though the ground under your feet feels cool and solid, deep at the middle you'd find a core so hot it can melt metal, heated by leftover energy from Earth's formation.
There is no giant lake of cold water down there, and the center is not hollow either; both ideas are the opposite of the hot metal core scientists have detected.
Scientists learn what's happening deep inside Earth by studying how earthquake vibrations travel through the planet, since different materials bend those vibrations in measurable ways.
earth
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