Surrounding a moving electron is
A. an electric field.
B. a magnetic field.
C. both of these
D. neither of these
Answer: C
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The theory of plate tectonics proposes that the _____ float on the Earth's _____.
A ) spreading centers, core B ) plates, asthenosphere C ) plates, magnetosphere D ) supercontinents, crust
A central circle on a station model that is 75 percent black and 25 percent white tells you
A) there is a 75 percent chance of rain. B) the cloud cover ranges over 70 to 80 percent of the sky. C) the northwest quadrant of the sky is clear, while the remainder of the sky is cloudy. D) it is currently raining in moderate amounts.
What happens to a barrier island as sea level rises?
a. ?It erodes away and disappears. b. ?It shifts seaward. c. ?It shifts landward. d. ?The wind picks up its sand to create dunes where the barrier island once was. e. ?The impact of the sea level on a barrier island in negligible.
Wildfires release so much energy from fuel that they can develop their own clouds called ________.
A. pyrocumulus B. cirrostratus C. pyronimbus D. pyrostratus