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
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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.
Which of the following minerals is a sulfide and commonly forms cube-shaped crystals?
A. halite B. hematite C. dolomite D. pyrite E. gypsum
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
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.