Most anthropogenic pollutants come from burning fossil fuels.
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Q31: Northern lights are also called aurora borealis.
Q32: Ground-level ozone is harmless.Stratospheric ozone is harmful
Q33: Tropos in Greek means to turn over
Q34: Ozone molecules break apart naturally in the
Q35: PM10 is more unhealthy than PM2.5.
Q37: Most meteors burn up in the mesosphere.
Q38: Gases enter the atmosphere through gas sinks.
Q39: Water vapor can occupy up to 4%
Q40: The atmosphere is kept pinned to Earth
Q41: Which is a methane sink?
A)photosynthesis
B)ultraviolet radiation
C)the oceans
D)rainfall
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