Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The mines have caused serious ………. of the river system.
A.mistakes
B.pollution
C.accidents
D.consumption

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
………. has been shown to cause floods and drought.
A.Gardening
B.Deforestation
C.Superstition
D.Polar ice melting

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Most people are aware of the need to reduce energy………. .
A.consumption
B.preservation
C.sources
D.disposal

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The organic gardeners avoid the use of ………. in their gardens.
A.germs
B.gases
C.vitamins
D.pesticides

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Forests are complex ………. that affect almost every species on the planet.
A.mysteries
B.organizations
C.rituals
D.ecosystems

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The ………. is a natural process that warms the Earth’s surface.
A.greenhouse fever
B.heating effect
C.boiling system
D.greenhouse effect

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Sulphur dioxide is a ………. and a major contributor to acid rain.
A.pollutant
B.fertilizer
C.pesticide
D.device

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
In agriculture, farmers often add ………. to enrich the soil.
A.waste
B.flavors
C.fertilizers
D.pesticides

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_____ is the current increase in the temperature of the Earth's surface (both land and water) as well as its atmosphere.
A.Global drought
B.Global warming
C.World heating
D.World fever

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Environmentalists would like to see ………. replaced by renewable energy sources.
A.fossil fuels
B.green energies
C.eco-energies
D.greenhouse effects