Homework: Cycling of Matter & Energy 2021

How is the carbon cycle similar to the water cycle?

• Both involve liquid substances falling to the Earth from the atmosphere.

• Neither process works at low temperature.

• Both involve the transfer of substances between animals, plants, and the Earth.

• Both involve the transfer of substances between the earth and outer space.

Which stage does the #2 show in the diagram?

• condensation
• evaporation
• precipitation
• run off

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

Which of the following are fossil fuels?

• Coal, water, oil

• Oxygen, coal, oil

• Coal, Oil, Natural Gas

• None of the above

TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.

• True
• False

What process occurs when coal (fossil fuel) is used for energy?

• Decomposition
• Combustion
• Pressurization 
• Respiration 

The diagram shows the flow of organic molecules through an ecosystem. What two processes are identified by the labels X and Y?

• X : Respiration
  Y : Predation
• X : Adaptation
  Y : Decomposition
• X : Fermentation
  Y : Nitrogen Fixation
• X : Decomposition
  Y : Respiration

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere
• lower levels of nitrogen in the atmosphere
• higher levels of carbon dioxide and other greenhouse gases in the atmosphere
• higher levels of oxygen in the atmosphere

How do carbon emissions lead to global warming?

• By trapping the sun's heat in the atmosphere.

• By causing very hot volcanic eruptions.

• Rocks become richer in carbon as time goes by.

• By increasing the amount of carbon in the earth's crust

Which of the following is the best conclusion that can be made from this graph?

• atmospheric carbon dioxide levels have been decreasing since 1960
• Hawaii has a lot of carbon dioxide
• humans have been working hard to decrease carbon dioxide levels
• atmospheric carbon dioxide levels have increased steadily since 1960