India once planted 30,000 varieties of rice; now most of the rice comes from how many varieties?
A. 10
B. 50
C. 100
D. 500
E. 2,500
Answer: A
Environmental & Atmospheric Sciences
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When light undergoes refraction, there is a change in its
A. frequency. B. wavelength. C. both of these D. neither
Environmental & Atmospheric Sciences
Describe the successes and failures of the economic and social development of the Russian Domain after the end of the Soviet era.
What will be an ideal response?
Environmental & Atmospheric Sciences
This relatively small volcanic feature consists of solidified lava and some volcanic ash. What kind of volcano is it?
A. volcanic dome B. shield volcano C. caldera D. composite volcano E. scoria cone
Environmental & Atmospheric Sciences
Discuss each of the following categories of water pollutants and the problems they cause: pathogens, organic wastes, chemical pollutants, and sediments
What will be an ideal response?
Environmental & Atmospheric Sciences