Instructions: Choose one answer from each pair of selections. Analysis of the oxygen-isotope ratio in ancient ice cores tells us the COLDER | WARMER the air was, the richer the concentration of oxygen-16 in the core
COLDER
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Because of the difficulty of projecting a round, 3-dimensional earth on a 2-dimensional piece of paper, paper maps of the world intentionally must distort any or all of the following except
A) shapes of the land masses. B) relative areas of the places on the map. C) absolute altitude of the land masses. D) compass directions. E) distances between places.
Which of the following occurs in the cumulus stage of an ordinary cell thunderstorm?
A. Hail is common. B. Thunder and lightning frequently occur. C. Cool air near the ground rises. D. Moist air rushes upward and forms an updraft.
Hundreds of millions of years ago, in the formation of fossil fuels, large amounts of
A) organic detritus were trapped underground. B) nitrogen were trapped in rocks during extensive volcanic activity. C) sodium were used to form ancient fossils, seashells, and limestone. D) phosphate gas were added to the atmosphere through erosion and evaporation.
During the ____, tornadoes are most likely to form over the southern Gulf states when the polar-front jet is above this region
a. late spring b. early spring c. autumn d. winter e. summer