Instrument used 2 draw a writen record of changing air pressure is called A.mercury B. barograph C. altimeter?

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Answer:
barograph

http://en.wikipedia.org/wiki/barograph...

B. barograph

A barograph. An altimeter measures the distance you are from ground level.

It's B...a Barograph (Associated with a Barometer)..It records variations in atmospheric pressure (Bars).

B - barograph. Here's a hint: the word "graph" is Greek for "writing"'; any instrument with the word "graph" in it will leave a written record.

This is a barograph or a barometric graph.

Barograph. The suffix "graph" means writing.

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