#RFB-11000697Reading: Fill in the BlanksAcademic,CoreMedium
Earth's Internal Heat
Official Question Material
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Most of Earth's internal heat is [blank] over from when our planet formed, about 4.5 billion years ago. Earth and the other planets in the solar system first began to take shape as countless smaller bodies collided and [blank] together. The energy of those violent collisions [blank] into heat energy.
Sample Answer & Audio Transcript
Most of Earth's internal heat is left over from when our planet formed, about 4.5 billion years ago. Earth and the other planets in the solar system first began to take shape as countless smaller bodies collided and clumped together. The energy of those violent collisions transformed into heat energy.
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