An electron vibrating at 1000 times per second generates an electromagnetic wave with a
A. period of 1000 s.
B. speed of 1000 m/s.
C. frequency of 1000 Hz.
D. wavelength of 1000 m.
Answer: C
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A. the study of maps B. a list of place-names C. a discipline that studies spatial patterns in the human and physical world D. the study of the effects of the stars
Which statement describes an impediment to mining the ocean floor?
A. Experts believe that working around volcanic vents is too dangerous. B. Countries cannot come to an agreement about who owns the minerals. C. Disturbance of the sea floor may release dangerous chemicals. D. No one has the ability to mine the deep ocean floor. E. Giant squid may interfere with the mining.
Predict which environmental challenge will be the most difficult for the Pacific Islands in the future
What will be an ideal response?
Considering the development issues of Central African Republic, Gabon, and the Democratic Republic of Congo, evaluate obstacles to development in Central Africa
What will be an ideal response?