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By combining three oxygen atoms, a/an ________________ layer formed in Earth's atmosphere, which absorbs UV photons.
Q1: Observations in the infrared have detected a
Q8: The Moon stopped evolving because it is
Q16: Which of the following are not found
Q38: What evidence do we have that Earth
Q47: Life emerged from the oceans 400 million
Q54: Even if societies on stars in distant
Q62: Shapley found the distance to the center
Q88: Hypothesize what kind of galaxy would result
Q93: Which of these gases is most responsible
Q93: Venus is often called Earth's sister planet