Schaefer and Langmuir discovered that dry ice could be used as a cloud seeding agent during which decade?

A) 1940s
B) 1920s
C) 1960s
D) 1970s


Answer: A

Environmental & Atmospheric Sciences

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The basic building block of all silicate minerals is the

A. silicate triangular structure. B. crystalline silicate sulfur. C. silicate tetrahedron. D. silicate cleavage direction.

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Which of the following minerals is a sulfide and commonly forms cube-shaped crystals?

A. halite B. hematite C. dolomite D. pyrite E. gypsum

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Which of the following best illustrates the connection between climate and geologic processes?

A) Water coming off a cooling magma emplaces metallic ores B) Hydrothermal vents near a mid-ocean rift create chimneys of mineral deposits C) Heavy rainfalls trigger debris flows D) Arid climates make sea level drop

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The Moon has been volcanically and tectonically inactive for more than

A. 2 million years. B. 1 billion years. C. 1 million years. D. 2 billion years.

Environmental & Atmospheric Sciences