To: blueunicorn6
This dirt thermos we call earth must have some tremendous insulation qualities to keep that rock liquid for billions of years. My coffee cools off in the thermos in a few hours.
The Earth's core has trillions of tons of radioactive elements that generate heat as they decay.
39 posted on
05/11/2011 2:21:59 PM PDT by
Colinsky
To: Colinsky
The earth also has tidal forces that generate a lot of heat.
52 posted on
05/11/2011 5:59:02 PM PDT by
Pikachu_Dad
(Impeach Sen Quinn)
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