Topic Test Answers

Methane hydrates in the ocean are a significant source of methane.

Scientists are concerned about the release of methane from the arctic because _______.a.as a greenhouse gas methane is 20 times more potent than carbon dioxideb.the mass of the arctic’s methane is comparable to that of the Earth’s coal beds c.global warming appears to be accelerating its released.all of the above

Salt marshes typically sit above the high tide mark.

Many cities in southeast Michigan are struggling with financial problems due to current economic conditions. At the same time, southeast Michigan is having one of the worst winters on record for snowfall amounts and hazardous road conditions. Which of the following unresolved problems would be a direct result of these two factors?a.city workers working longer hours to keep up with the snowfall amountsb.more city workers than the current financial budget can affordc.less city workers to plow the streets causing an increase in the number of car accidents during the winter monthsd.an increase in the number of damaged snow plows

Legislation has been ineffective at preserving coral reefs.