Question

26.

Which of the following pollutants are most likely to lead to reduced oxygen content in a river?

Group of answer choices

Heavy metal contamination

Radioactive materials

Pesticide run-off

Thermal pollution

27.

In terms of total amount, which of the following water pollutants is the biggest threat to *ecosystems*?

Group of answer choices

infectious agents

fertilizers and pesticides

sediments

oil and other organic pollutants

28.

What does the large majority of climate scientists agree about?

Group of answer choices

Since people like warm weather, concerns about the current change in global climate are unfounded.

It is easy to make a computer model that accurately predict future global climate change.

The melting of polar ice caps and glaciers are causing an increase in atmospheric CO2 concentrations.

Increasing amounts of carbon dioxide in the atmosphere from burning of fossil fuels is resulting in an increase in average global temperature.

The thinning of the ozone layer lets more ultraviolet light into the atmosphere and this is the major cause of global climate change.

29.

What caused the successful ban of CFCs as aerosol propellants?

Group of answer choices

Public pressure on the government caused by concern about the thinning ozone layer

Signing of the Kyoto protocol to prevent global warming

A good scientific understanding of how CFCs increases ozone pollution

The concern of environmental groups about negative effects of acid rain

30.

Why is acid deposition a problem in aquatic ecosystems?

Group of answer choices

Lowering of the pH is the main cause of cultural eutrophication.

Most life in aquatic ecosystems is adversely affected by pH levels below 5.

Acid deposition lowers the water temperature, which affect cellular respiration in most fresh water fish.

Most aquatic plants and animals need an environment with pH levels 10-14.

Answer 1

26. Heavy metal contamination, Pesticide run-off, Thermal pollution

27. fertilizers and pesticides

28.

The melting of polar ice caps and glaciers are causing an increase in atmospheric CO2 concentrations.

Increasing amounts of carbon dioxide in the atmosphere from burning of fossil fuels is resulting in an increase in average global temperature.

The thinning of the ozone layer lets more ultraviolet light into the atmosphere and this is the major cause of global climate change.

29.

Public pressure on the government caused by concern about the thinning ozone layer

Signing of the Kyoto protocol to prevent global warming

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