The heat that caused melting in the Earthís early history was supplied from which of the following events or causes ?

• a)
  volcanic activity and radioactivity
• b)
  solar heating and volcanic activity
• c)
  a large impact event and radioactivity
• d)
  a large impact event and solar heating

Correct answer is option 'C'. Can you explain this answer?

Related Test: Geology Model Test - 2017

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