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As water flows downhill, its energy can be used to generate electricity. Later, this water may evaporate, fall as rain, and be used again to generate electricity in the same way. This explains why electricity generated with water is considered*
The fast food industry in the United States buys many russet potatoes from farmers. Therefore, most potato farmers grow russet potatoes. If farmers continue to plant the same crop in the same fields year after year without putting additives into the soil, the end result could be*
Many scientists are worried about some of Earth’s finite resources because humans are*
Many beverage companies are required to recycle bottles and cans because this activity directly reduces*
Nonrenewable resources are*
According to scientists, ocean waves could be a source of energy. Devices are being designed to capture the energy from waves and supply electricity to coastal areas. A direct benefit of utilizing this technology to produce energy would be the*
Which graph best shows the changes in global human population and natural resource use over the past 500 years?
The burning of fossil fuels has harmed the environment by*
New York State charges consumers a fee when purchasing beverages sold in aluminum cans and plastic bottles. This money is returned to purchasers when they return these items for recycling. Programs such as these are an attempt to*
Humans deplete the most resources when*
The finite resources of Earth are often affected by increasing human consumption. These finite resources are*
Base your answer to question 12-15 on the information and graph below and on your knowledge of biology.
At an observatory in Mauna Loa, Hawaii, scientists have been measuring and collecting data related to changes in the atmosphere since the 1950s. The remote location of the observatory makes it ideal for studying atmospheric conditions that can cause climate change. One specific measurement taken is the amount of atmospheric carbon dioxide. Information for a 7-year period is shown in the graph below.
Analyze the data shown in the graph. In your answer, be sure to:
• state the overall relationship between time and carbon dioxide levels 
• state one possible cause for the overall change in the carbon dioxide levels shown in the graph 
• identify the biological process that might account for the decreases in carbon dioxide levels 
• identify two actions carried out by humans that could lower carbon dioxide levels *
State why fossil fuels are considered a finite resource. *
Base your answers to questions 17 on the information below and on your knowledge of biology.
New York State relies on natural gas for 24% of its energy supply. It is estimated that large deposits of natural gas are located in New York State. It is possible to extract the gas via high-volume hydraulic fracturing (hydrofracking). Hydrofracking involves freeing the natural gas by using a large amount of water treated with chemicals, which produces large quantities of waste products. Some people are in favor of hydrofracking, while others are against it. One side is concerned about the negative effect it will have on the environment. The other side points out the potential benefits it might provide.
Identify one renewable alternative to natural gas as an energy source that New York State could use and describe the advantage of using this source, other than it is renewable. *
Base your answers to questions 18 on the information below and on your knowledge of biology.
Green Algae Could Help Clean up Radioactive Nuclear Waste
Recent studies have shown that the uses of green algae are boundless. First, scientists at R.I.T. used algae to synthesize biofuel, and recently scientists at Northwestern University and Argonne National have found that freshwater algae can remove strontium 90 from radioactive wastewater. These developments can significantly aid the future effort to clean up radioactive waste at the Fukushima Daichi Plant [a nuclear power plant in Japan]. Scientists discovered that the process begins when the green algae first absorb strontium, calcium and barium from water. The strontium and barium form crystals inside each algae cell. The crystals remain inside the cells, but the algae filters out and excretes calcium and other minerals that may be present. The strontium is then isolated, and thus able to be treated.
Researchers are still figuring the best way to harness the algae’s capabilities. Since algae doesn’t differentiate between radioactive and inactive strontium (they are chemically identical), it is not known how the algae would hold up in a highly radioactive environment. But the good news is that they have been able to manipulate the algae’s process to be more strontium-selective, thus removing as much as possible.…
State one specific way that radioactive wastes from nuclear fuels can be harmful to humans. *