One possible feedback effect of global warming that could "run away" unpredictably is
A) warming of the Pacific ocean stops the El Niño phenomenon which leads to further warming of the Pacific.
B) warming leading to decreased cloud cover leading to further warming.
C) ozone depletion that allows more ultraviolet to strike Earth, leading to further ozone depletion.
D) melting Arctic ice leading to increased absorption of radiation leading to further warming.
D
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The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
A. real and closer to the viewer than the object. B. virtual and closer to the viewer than the object. C. real and farther from the viewer than the object. D. virtual and farther from the viewer than the object. E. virtual and the same distance from the viewer as the object.
Wave Characteristics: For a certain electromagnetic wave in free space, at one instant the electric field vector points in the +z direction while the magnetic field vector points in the +x direction, as shown in the figure. In what direction is this wave traveling?
A. +x B. -x C. +y D. -y E. +z
Rate this statement: No force due to Earth's gravity acts on astronauts inside the orbiting space station
A) always true while in orbit B) sometimes true while in orbit C) always false
Radioactive Decay: The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days. If the initial decay rate of the sample is 6.2 × 1017 Bq, what is the decay rate after 37 days?
Fill in the blank(s) with the appropriate word(s).