Thin, wispy clouds blown by high winds into long streamers, called mare's tails, are ____
A) stratus
B) cirrocumulus
C) altostratus
D) cirrus
D
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Teratogens
A. are fatal to humans in low doses. B. cause birth defects. C. are harmful largely as allergens. D. cause mutations. E. are transmitted genetically.
Only 5% of the Earth's land is strictly protected from human activities. With this level of protection, which of the following statements is the reason that so many land species are increasingly threatened with extinction?
A. Because conservation biologists say we need to strictly protect 20%. B. Because so much land is being lost to flooding from rising sea levels. C. Because of reduced sunlight from atmospheric pollution. D. Because of a dramatic increase in earthquakes and volcanoes.
When freight cars collide, momentum is conserved in
A. elastic collisions. B. inelastic collisions. C. both of these D. none of the above
Which of the following are differences between an eruption column and pyroclastic flow?
A. Tephra in an eruption column stays hotter until it reaches the ground. B. Damage from an eruption column is more restricted than a pyroclastic flow. C. A pyroclastic flow rises higher into the atmosphere than an eruption column. D. A pyroclastic flow forms when the gas flux cannot support the column.