Earth constantly takes in more heat from the Sun. Earth has forests that provide heat through photosynthesis. Earth has oceans that store heat. Earth absorbs extra heat from molten lava.
I gave my students this multiple choice question: Since Earth radiates heat into outer space, why is Earth's surface not becoming colder?

Only one answer is correct among these 4 choices:
- Earth constantly takes in more heat from the Sun.
- Earth has forests that provide heat through photosynthesis.
- Earth has oceans that store heat.
- Earth absorbs extra heat from molten lava.

Could you tell me which one is correct?

Earth constantly takes in more heat from the Sun.