(A)

Oxygen

(B)

Nitrogen

(C)

Methane

(D)

Argon

(A) Plastic

(B)Cloth

(C)Oil spill

(D)Septic tank waste

(A)

 Heavy rainfall (from a single storm) in an area of low average annual rainfall.

(B)

Steep slopes in a tropical rainforest.

(C)

An agricultural region where soil conservation practices are implemented.

(D)

An area that has been urbanized for several decades or more.

(A)

ruralism

(B)

secularization

(C)

evolution

(D)

urbanization

(A)

Doha

(B)

Copenhagen

(C)

New York

(D)

London

(A)

entering of polluted water to the water table.

(B)

the construction of polluted water.

(C)

the construction of well.

(D)

oil spills.

(A) Damage to digestive system

(B)Increased liver cancer

(C)Neurological disorder

(D)Increased skin cancer

(A) Children are more susceptible to pesticides because they weigh substantially less than adults.

(B)Lethal doses of pesticides are larger for children than for adults.

(C)Children are more sensitive to pesticides than adults because adults have built up immunity to the pesticide chemicals.

(D)Children have more stringent pesticide regulations to protect their health than do adults.

(A)

contamination by human wastes.

(B)

phosphorus contamination.

(C)

decreased biological oxygen demand.

(D)

hydrocarbon contamination.

(A) Gases escaping the earth

(B)Particles reflected off the moon

(C)Particles given off by the sun

(D)Radiation from earth's magnetic field