What is the addictive drug in tobacco ______________?

A. Ethanol
B. Nicotine
C. Ammonia
D. Tar

Which of the following chemicals is not found in tobacco smoke?

A. Chlorine bleach
B. Rocket fuel
C. Nail polish remover
D. Barbecue lighter fluid

The atmospheric greenhouse effect is produced mainly by the __________________?

A. Absorption and re-emission of visible light by the atmosphere
B. Absorption and re-emission of ultraviolet radiation by the atmosphere
C. Absorption and re-emission of infrared radiation by the atmosphere
D. Absorption and re-emission of visible light by clouds

At what time of day is the relative humidity normally at a minimum ________________ ?

A. When the air temperature is highest
B. Just before sunrise
C. About midnight
D. When the air temperature is lowest

Water vapor is ______________?

A. A gas
B. A cloud droplet
C. A rain drop
D. A snowflake

Acid deposition causes ______________________?

A. The greenhouse effect to lessen
B. Lakes and forests to die
C. Acid indigestion in humans
D. All the above are correct

Salinization is ___________?

A. Accumulation of salts in water
B. Accumulation of salts in soil
C. Accumulation of salts in body
D. Accumulation of salts in animals

The gradual physiological adjustment to slowly changing new environmental conditions is known as _____________________?

A. Selection
B. Introduction
C. Acclimatization
D. Quarantine

The atmosphere near the earth’s surface is “heated from below.” Which of the following does not significantly contribute to this heating _____________________?

A. Conduction of heat upward from a hot surface
B. Convection from a hot surface
C. Absorption of infrared energy that has been radiated from the surface
D. Heat energy from the earth’s interior

The blueness of the sky is mainly due to _____________?

A. The scattering of sunlight by air molecules
B. The presence of water vapor
C. Absorption of blue light by the air
D. Emission of blue light by the atmosphere