The troposphere is composed of 99%

A. hydrogen and oxygen.
B. nitrogen and oxygen.
C. hydrogen and methane.
D. carbon dioxide and nitrogen.
E. helium and hydrogen.


Answer: B

Environmental & Atmospheric Sciences

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A) They mean the same thing. B) Plutonic comes from the Greek god of the underworld; intrusive rocks are formed beneath the surface of the Earth. C) Plutonic comes from the Roman god of the ocean; intrusive rocks are formed in water. D) Plutonic comes from the Roman god of fire; intrusive rocks form from lava on the earth's surface.

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The Java Sea separates ________ from ________

A) Java island; Borneo Island B) Sunda Islands; Australia C) Vietnam; Philippines D) Singapore; Sumatara Island

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Weather deals in days, while climate deals in decades, centuries, and even millennia

Indicate whether the statement is true or false

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The U.S. imports over 50% of its petroleum, mostly from what country?

a. Saudi Arabia b. China c. Brazil d. Canada e. India

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