46. The tropical and temperate deserts of the world, occupy nearly ____ of the land surface of the worlds.

A. (1/4) th
B. (1/3) rd
C. (1/2)
D. (1/7) th

47. The shortest day (longest night) in the southern hemisphere is

A. June 21
B. December 21
C. December 22
D. June 20

48. The smallest glaciers are

A. Mountain or alpine glaciers
B. Continental glaciers
C. Piedmont glaciers
D. None of the above

49. The time interval between one vernal equinox and the next is nearest to which of the following figures?

A. 359 days
B. 361 days
C. 363 days
D. 365 days

50. Which of the following is measured on the Richter scale?

A. Density of liquids
B. Intensity of earthquakes
C. Velocity of tornadoes
D. Height of mountains