Convergent boundaries are
A) regions of great mountain building.
B) areas of plate subduction.
C) regions of plate collision.
D) all of the above
D
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What was Niels Bohr's explanation for the observation of atomic spectra?
A. Electrons could only move in discrete energy steps within an atom. B. Only certain photons with the correct energy could excite the quanta in the nucleus. C. Nucleons could be excited by different electron energies. D. Any photon could excite an electron. E. Electrons could not move in an atom.
A friend produces a Geiger counter to check the local background radiation. It ticks. Another friend, who normally fears most that which is understood least, makes an effort to keep away from the region of the Geiger counter and looks to you for advice. What do you say?
A. The Geiger counter is emitting radiation. B. Wear heavy clothes. C. The Geiger counter is detecting naturally occurring radiation from your body. D. Run away as fast as you can!
If the Earth did not rotate, which of the following best describes how air would flow?
A. from the west B. to the right of its direction of motion in the northern hemisphere C. perpendicular to isobars D. to the left of its direction of motion in the northern hemisphere
Cloud seeding:
A) has been of substantial benefit to farmers on the Great Plains. B) uses dry ice to increase the temperature of very cold clouds. C) uses silver iodide to promote homogeneous nucleation. D) has been able to increase rainfall in the Sierra Nevada under certain conditions.