unit 7 review

1. How do greenhouse gases cause global warming?

• A. They absorb heat radiated from Earth’s surface.

• B. They reflect solar energy from Earth’s exosphere.

• C. They produce smog, which traps thermal energy near the ground.

• D. They damage the ozone layer, allowing more solar energy to enter the atmosphere.

5. Which greenhouse gases are correctly paired with their sources? Choose all that apply.

Pick up to 2 answers

THE FIRST ANSWER IS A

• A. . Carbon Dioxide - burning coal and oil

• B. Nitrous oxide - cellular respiration

• C. Methane - plastic manufacturing

• D. Chlorofluorocarbons - air conditioners, refrigerators and insulation

4. An invasive species, the spiny water flea, was recently found in a Maryland lake. These water fleas eat zooplankton, a food also consumed by native fishes. The fleas spread from lake to lake by attaching to fishing lines, anchor ropes, and boats. Which statement best describes the effect of the water flea on the lake?

• A. It will not compete with animals in the local food chain.

• B. It will feed on organisms that are important to other species.

• C. The number of water fleas will decrease due to a lack of food.

• D. There will be no effect on native species in the lake.

3. Acid rain has become a pressing problem in Maryland where fishing is a way of life, and an integral part of the economy. Controlling acid rain is especially important in Maryland restoration and preservation of the Chesapeake Bay. Evidence that acid rain negatively affected the Chesapeake Bay ecosystem is that ______.

• A. rain has increased the amount of water in lakes and streams in the area

• B. there has been a decrease in the variety of fish found in the Chesapeake Bay

• C. the amount of carbon dioxide in the air over the Maryland has drastically decreased in recent years

• D. the number of heterotrophic organisms in lakes and streams has increased

2. Consider the following sequence of events:

Human beings discover a way to remove CO from the atmosphere.

Using this process, we remove half of the CO from the atmosphere.

Many plants grow slower, slowing down the rate of photosynthesis. CO levels begin to rise.

This is an example of a ___________.

• A. negative feedback in the climate system.

• B. positive feedback in the climate system.

6. The recent increase in global temperature that is caused by the greenhouse effect is primarily due to ___.

• A. increased solar activity

• B. volcanic eruptions

• C. increase in the percentage of forested area

• D. burning of fossil fuels

7. The graph indicates that the number of species that have become extinct ____.

• A. has increased with increasing human population

• B. has decreased with increasing human population

• C. is not affected by the size of the human population

• D. is greater than the size of the human population

8. The rapid increase in human population between 1960 and 2010 is most likely the direct result of advances in ____.

• A. medical technology

• B. space exploration

• C. communication technology

• D. marine exploration

9. Which is the strongest evidence for climate change?

• A. A colder-than-average winter

• B. A warmer-than-average summer.

• C. A pattern of major blizzards affecting several cities in a particular winter.

• D. A pattern of increasing frequency and intensity of storms over many years.

10. Which statement is supported by the graph?

• A. Climate change will result in the melting of polar ice caps.

• B. The increase in carbon dioxide levels will cause a decrease in global average temperature.

• C. Human activities have no effect on atmospheric carbon dioxide levels

• D. Future generations can be affected by the choices of current generations.