Which of the following is true regarding ozone depletion in Antarctica?
A) Increasing levels of ultraviolet radiation have not actually been measured at this time.
B) The atmosphere above Antarctica has experienced a complete loss of protective ozone.
C) Maximum ozone depletion occurs during the Antarctic spring, following the development of polar stratospheric clouds in winter.
D) There has actually been a decrease in ultraviolet levels measured at the surface—which is contrary to what is predicted by ozone depletion models.
C
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We can say that the United States has _____________freshwater scarcity stress
a. No b. very little or minimal c. Average d. Spotty e. Widespread
What was the cause of flooding in the 1993 upper Mississippi River flood?
A) Heavy snowmelt in Canada sent large volumes of water down the river in the spring. B) A dam failed because it had been built in a risky place near a fault. C) Persistent thunderstorms caused large amounts of rainfall over a several-state region. D) Winter produced rain that melted snow that was on the ground.
________ develop where oceanic lithosphere bends downward and sinks into the mantle
A) Rift valleys on mid-ocean ridges B) Submarine canyons C) Abyssal seamounts D) Deep ocean trenches
Instructions: Choose one answer from each pair of selections. The nuclear winter scenario envisions an upper level layer of strongly REFLECTING | ABSORBING soot particles, which would cool Earth's surface by reducing the amount of sunlight able to reach the ground