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Exam 24: Human Impacts, Biodiversity, and Environmental Issues

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Question 21

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Smog forms when pollutants in the air react with each other in the presence of sunlight and carbon dioxide.

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Question 22

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Scientists have identified approximately ________ million species of organisms, but millions more are thought to exist.

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Question 23

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Destruction of the ozone due to pollutants is limited to layers located only above North America.

Increasing population density on marginal lands in rural areas has resulted in desertification, which reduces the ability of the land to sustain the population.

Subsistence farming in tropical regions of the world results in habitat loss because of the practices of ________ and ________.

________ is a biomass fuel.

The presence of chemicals or particles in air that have adverse effects on living organisms is termed

Biodiversity refers to the variety of richness of species on Earth.

The death of animal life in a shallow body of water in conjunction with a rapid increase in plant life is known as ________.

Commercial logging by European countries in the Ivory Coast has reduced the pristine 70 million acres of forests that once existed to about

Human activities have resulted in at least one-third of the landmass of Earth being altered in some way.

Although humans have had a negative impact on biodiversity in the past, the present global extinction rate is 20 times lower now than at any other time in the past.

Sources of energy that are renewable and derived from plants are called ________.

Some pollutants such as mercury or DDT become concentrated in the tissues of organisms higher on the food chain through a process referred to as ________.

Hydrocarbons and nitrogen oxides combine with water vapor in the presence of sunlight to form a gray layer of ________.

What percent of Earth's water is fresh water?

Deep underground reservoirs of water are called

Which one of the following statements is TRUE regarding the water on Earth?

According to public health officials, all of the following may be caused by water pollutants EXCEPT which one?

Humans have become so dependent on fossil fuels that despite an increasing body of evidence that indicates burning these fuels is destroying aspects of the environment, little change in the sources of fuels has occurred. What types of alternative fuels can be used to reduce negative impacts on the environment?