A. Hailstorms
B. Thunders
C. Rain
D. Lightning
A. Edward Jenner
B. Laren
C. Karl Landsteiner
D. William Harvey
A. 3%
B. 33%
C. 0.3%
D. 0.03%
A. Solid, liquid, gaseous
B. Solid and liquid
C. Solid and gaseous
D. None of these
A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
The average adult at rest inhales and exhales something like 7 or 8 liters (about one-fourth of a cubic foot) of air per minute. That totals something like 11,000 liters of air (388 cubic feet) in a day.
The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.
A. Fluorine
B. Bromine
C. Sodium
D. Oxygen
A. Cirrocumulus
B. Cirrus
C. Cirrostratus
D. All of these