Earth's original atmosphere was
A) very similar to the atmosphere we have today.
B) rich in both O2 and O3.
C) obliterated after the birth of the Sun.
D) a mixture of N2,CO2,and O3.
Correct Answer:
Verified
Q2: Plants evolved the ability of photosynthesis during
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
Q8: What is the significance of the ozone
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
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