Multiple Choice
Your ears "pop" when your plane descends because
A) air is moving from the outside into behind your eardrum.
B) air is moving from your eardrum to the outside.
C) the air pressure in the plane decreases.
D) the fluid in your Eustachian tubes exerts pressure on your eardrums.
Correct Answer:

Verified
Correct Answer:
Verified
Q19: Normal atmospheric pressure is enough to support
Q20: When a glass filled with a cold
Q21: The capacity of the air to hold
Q22: In still air at constant pressure, the
Q23: A psychrometer measures<br>A)atmospheric pressure.<br>B)altitude.<br>C)relative humidity.<br>D)ultraviolet light intensity.
Q24: Earth's atmosphere is composed chiefly of nitrogen,
Q25: The upward movement of warmer, less dense
Q26: The atmospheric concentration of carbon dioxide is
Q27: The wind chill factor<br>A)is the cooling power
Q29: The wind chill factor<br>A)measures the effect of