Which of these statements about oil shale production is accurate?
A. Compared to conventional oil, shale oil production emits more CO2 per barrel.
B. Compared to tar sands oil, shale oil production emits more CO2 per barrel.
C. Compared to conventional oil, shale oil production causes less water pollution.
D. Compared to conventional oil, shale oil production causes less air pollution.
Answer: A
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Invasive species have been
A) hunted to extinction in most places where they occur. B) successfully controlled in most regions using predators, viral agents, or bacterial agents. C) successfully controlled by the introduction of other alien species that are natural competitors. D) an ecological problem in North America since the first European colonists arrived.
What type of eruption formed the small volcano in this photograph?
A. eruption of viscous lava B. eruption column C. pyroclastic flow D. fluid lava flows E. lava fountain
The North Pole is covered by glaciers
Indicate whether the statement is true or false
In 2010, there were 23 official EU business languages.
a. true b. false