The oxygen in Earth's atmosphere was first created 2.3 billion years ago by:
A) the impact of a massive comet.
B) photosynthesis.
C) the evaporation of water during a warming period.
D) solar radiation.
Correct Answer:
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Q23: A planet that experiences an increase in
Q24: If the greenhouse effect were to increase
Q25: If the amount of ozone in the
Q26: Which of the following is essential for
Q27: Earth's magnetic field is created by:
A) the
Q29: Maria are:
A) captured moons of the gas
Q30: Tidal locking is responsible for:
A) the Sun's
Q31: The atmospheric layer in which most weather
Q32: Earth's original atmosphere escaped into space because:
A)
Q33: Which of the following is important for
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