What is the sun powered by?

How does hydrogen nuclei produce helium nuclei and large amounts of energy?

What is the total amount of energy released by the sun?

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From the solar energy reaching the Earth's surface, about how much of it makes it down to the Earth's surface?

What is the solar energy that enters the Earth's atmosphere called?

What is an electromagnetic spectrum?

What is the ozone layer?

What would happen if the ozone layer did not absorb ultraviolet radiation?

What are some examples of high energy forms of electromagnetic radiation?

What can these forms of electromagnetic radiation do?

What is chlorofluorocarbon?

What are greenhouse gases?

What are some examples of greenhouse gases?

What do infrared waves do?

How does Earth remain balanced?

What is contrail?

What would happen if less energy was lost than gained?

What is an enhanced greenhouse effect?

What is a greenhouse effect?