How thick is our atmosphere?

What is air?

Why is it cooler in the mountains? Warmer in the city?

What keeps Earth warm and wet?

What layer of the atmosphere is the ozone layer in?

What layer of the atmosphere protects the Earth from meteors?

Which layer of the atmosphere does Earth's weather occur?

Which layer of the atmosphere has no definite outer limit?

What is ozone made out of?

Which layer do satellites orbit?

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