Human Impact

Which of the following statements is true of Earth's carrying capacity?

• It is infinitely expandable.

• It was reached in the last century.

• It has been increased by technology but still has limits as the earth's population grows

• It grows larger as population increases.

Which of these is an example of a nonrenewable resource?

• sun

• water

• wind

• coal

The amount of carbon a person emits in his or her lifetime

• nonrenewable resource.

• renewable resource.

• carrying capacity.

• carbon footprint.

Pollutants in the water cycle can cause rain to

• become more acidic than normal.

• be saturated with particulates.

• fall heavily and cause flooding.

• keep water neutral

The increase in global temperatures is known as

• the greenhouse effect.

• acid rain.

• global warming.

• pollution

What happens during biomagnification?

• Scientists use microscopes to look at pollutants.

• Pollutants increase in concentration as they move up the food chain.

• Water-soluble pollutants become more concentrated.

• Animals in the food chain become larger.

Which of the following organisms is likely to be most affected by biomagnification of a pollutant?

• phytoplankton

• zooplankton

• fish

• hawk

Which of these is a major cause of extinction?

• biodiversity

• loss of habitat

• the greenhouse effect

• use of plants for medicine

How can introduced species disrupt ecosystems?

• by causing habitat fragmentation

• by increasing biodiversity

• by crowding out native species

• by decreasing competition

The recovery of the bald eagle is partly a result of which law?

• Clean Air Act

• Clean Water Act

• Endangered Species Act

• Water and Air Pollution Act