Because ________ magmas are the most viscous, they are associated with the most violent eruptions.

A. water-rich
B. carbon dioxide-rich
C. silica-rich
D. older
E. iron-rich


Answer: C

Environmental & Atmospheric Sciences

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Which of the following statements is false?

A) After hitting a peak around 1970, the world NIR has been declining steadily through the late twentieth century and the early twenty-first B) Between 1980 and 2010, the CBR declined in most of Western Europe C) In most countries, the decline in the NIR has occurred because of lower birth rates D) Western Europe has always emphasized the availability of contraceptives rather than education and improved health care to bring down CBRs E) Countries with high NIR rates tend to have lower literacy rates compared to those with low NIR

Environmental & Atmospheric Sciences

Compared to a cold front, warm fronts are about

A) twice as steep. B) half as steep. C) as steep. D) three times as steep.

Environmental & Atmospheric Sciences

The terms typhoon and cyclone refer to the initial weaker stages in the development of a hurricane

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The Earth is a Goldilocks planet.

a. true b. false

Environmental & Atmospheric Sciences