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Heat left over from when the earth was formed about 4.6 billion years ago is one source of INTERNAL energy. What is the other source?

Question 6 options:

the sun


the ocean


radioactive substances in the earth's interior layers

2 Answers

2 votes

Answer:

the ocean

Step-by-step explanation:

User KishuDroid
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8 votes

Answer:

the gravity

Step-by-step explanation:

i hope you help this answer

User Shaneice
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