Why is water vapor not implicated in climate change as methane and carbon dioxide are?
A) Water vapor is not a greenhouse gas.
B) Carbon dioxide and methane are not just greenhouse gases, they are also toxic to most organisms.
C) The concentration of water vapor in the atmosphere has remained relatively constant despite changes in human activities.
D) Water vapor is a liquid, not a gas, so it precipitates out of the atmosphere frequently.
C
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Mathematics is useful in physics when
A. making scientific measurements. B. relationships are studied. C. calculating trajectories of projectiles. D. all of the above
The famous Aswan High Dam is located in which nation?
A) Iraq B) Egypt C) Iran D) Lebanon E) Turkey
Which of the following statements is true about North American Datum (NAD)?
A. NAD83 is a newer datum than NAD27. B. Maps based on NAD83 can register spatially with maps based on NAD27. C. NAD83 is based on a satellite-determined spheroid. D. All of these are correct E. Both NAD83 is newer and NAD83 is based on.
What is a primary source of mercury fallout in the U.S. today?
A. Coal-fired power plants B. No-till agriculture C. Testing of nuclear weapons D. Launches of spacecraft