Water vapor can occupy up to 4% of the atmosphere by volume.
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Q34: Ozone molecules break apart naturally in the
Q35: PM10 is more unhealthy than PM2.5.
Q36: Most anthropogenic pollutants come from burning fossil
Q37: Most meteors burn up in the mesosphere.
Q38: Gases enter the atmosphere through gas sinks.
Q40: The atmosphere is kept pinned to Earth
Q41: Which is a methane sink?
A)photosynthesis
B)ultraviolet radiation
C)the oceans
D)rainfall
Q42: Which is a water-vapor sink?
A)evaporation
B)condensation
C)ultraviolet radiation
D)fossil fuels
Q43: What did the Montreal Protocol mandate?
A)the phaseout
Q44: 
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