Use the graph to answer the following question. Pressures are listed in an alternate unit of kilopascals (kPa).
At what altitude is the air pressure is 60 kPa (450 mmHg)?
a 4200 m
b 6300 m
C 7000 m
d 1800 m

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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plasma - state of matter made up of electrically charged particles

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