What is the significance of the ozone layer?
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Q3: Compared with San Francisco,California,winter air temperatures and
Q4: Earth's first atmosphere was composed of
A)oxygen,hydrogen,and helium.
B)hydrogen
Q5: The Earth's oceans evolved
A)from condensation of water
Q6: Coastal lands bordering the oceans generally have
A)colder
Q7: Earth's original atmosphere was
A)very similar to the
Q9: Ozone in the Earth's upper atmosphere
A)filters incoming
Q10: The process of photosynthesis is important because
Q11: Fresh water enters the ocean by runoff
Q12: Earth's earliest atmosphere was lacking in
A)carbon dioxide.
B)hydrogen.
C)free
Q13: The origin of Earth's primitive ozone layer
A)is
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