Unit 7 Impact of Humans Test Review

What is the greenhouse effect?

• the burning of fossil fuels causes gases to mix with water in the atmosphere
• ground level ozone and vehicle exhaust react in the presence of sunlight
• certain gases such as carbon dioxide act like a blanket and keep the sun's energy close to earth

According to the pie chart, how much carbon dioxide emissions come from transportation?

• 7.9%
• 25.9%
• 13.1%
• 19.4%

What is one way that humans can lessen their impact on the environment?

• Recycle
• Eat more meat
• Drive large vehicles
• Increase agricultural area

As the human population grows, the demand for natural resources increases. Which activity wastes a natural resource?

• riding the bus

• keeping the lights turned off

• cooling a car or house by opening windows

• throwing an aluminum can in the trash

What is the best explanation for the rise in atmospheric CO² levels since the 1800's?

• natural fluctuations of the climate

• eruptions of large volcanoes

• increased use of fossil fuels by humans

• photosynthesis by algae

What will most likely happen if the human population continues to grow at current rates?

• There will be an decrease in the number of strong hurricanes

• There will be a decrease in water pollution

• There will be an increase in nitrogen levels in the atmosphere

• There will be fewer natural resources available for future generations

The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas suggests that

• ecosystems are interconnected and human action can alter ecosystem equilibrium.
• recycling programs have failed to conserve biotic resources.
• natural processes can alter ecosystem stability.
• direct harvesting practices have led to irreversible destruction of ecosystems.

One of the ways we increase the amount of carbon dioxide is

• use less fossil fuels
• use alternative energy sources
• remove trees
• plant GMO crops

How can the planting of new trees help reduce climate change?

• Trees help create breezes.
• Trees release moisture that cools the atmosphere.
• Trees take in carbon dioxide from the atmosphere during photosynthesis.
• Trees block the release of greenhouse gases from soil.

Which is a cause of climate change?

• melting of sea ice
• cutting down trees
• severe storms 
• changes in plant life