81.
The important mountains of Europe include

82.
The last major glacial period began about 2,000,000 years before present and is commonly known as

83.
The imaginary axis at which the earth rotates remains inclined at an angle of ____ to the plane of earth's orbit.

84.
The ionosphere contains ionized air that protects the earth from

85.
The horizontal of soil profile is composed of

86.
The largest city in Latin America is

87.
The highest and lowest values of a weather element observed over the entire period of record are

88.
The highest mountain peak of Oceania is

89.
The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of

90.
The largest gulf in the world is

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