Exposure to this primary pollutant is associated with damage to the nervous systems of young children
A) nitrogen oxide B) lead C) sulfur dioxide D) carbon monoxide
B
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The Pamir Knot
A) is located in Turkmenistan. B) refers to the political isolation experienced by Azerbaijan on the western side of the Caspian Sea. C) is the term for the border between Mongolia and China. D) is a complex tangle of east-west and north-south trending mountain ranges on the borders of Afghanistan, Tajikistan, Pakistan, and China. E) refers to the mountainous region lying on the border between Nepal and China.
The age of the Sun is about
A) 7000 years. B) 5.5 million years. C) 5.5 billion years. D) 5.5 trillion years. E) more than 5.5 trillion years
The first sea voyagers are thought to be the ____
a. Egyptians b. Cretans c. Greeks d. Vikings e. Polynesians
There is some evidence that increases in greenhouse gas concentrations are responsible of the vast majority of global warming over the last century.
Answer the following statement true (T) or false (F)