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Type: Multiple-Choice
Category: Earth's Layers
Level: Grade 9
Score: 2
Author: grody311
Last Modified: 4 months ago

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Earth's Layers Question

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Grade 9 Earth's Layers

What is one reason that Earth's core is so hot?
  1. Coal and oil burn in the core.
  2. As heavy elements in the core decay, they produce radioactive heat.
  3. The Sun heats up Earth and causes the inside to melt.
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