66. The imaginary axis at which the earth rotates remains inclined at an angle of ____ to the plane of earth’s orbit.

A. 44 1/2 °
B. 55 1/2 °
C. 66 1/2 °
D. 0 °

67. The ionosphere contains ionized air that protects the earth from

A. the ultraviolet rays of the sun
B. the infrared rays of the sun
C. the falling meteorites
D. None of the above

68. The horizontal of the soil profile is composed of

A. weathered parent material that is not affected by translocation and organic modification
B. material affected by translocation & organic modification
C. unweathered bedrock
D. None of the above

69. The largest city in Latin America is

A. Mexico city
B. Caracas
C. Rio-de-Janeiro
D. Buenos Aires

70. The highest and lowest values of a weather element observed over the entire period of record are

A. extremes
B. average extremes
C. absolute extremes
D. relative extremes