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Free oxygen was a common constituent of the Earth's early atmosphere.
Q3: The location of the Prime Meridian is
Q7: The average distance from Earth to the
Q17: Heat is measured in _.<br>A) degrees Celsius<br>B)
Q22: The amount of energy released during a
Q30: Which layer is believed to behave most
Q46: The large volcano known in the solar
Q58: Earth's low-latitude deserts and steppes coincide with
Q59: Which statement(s) about El Niño is(are) true?<br>A)
Q64: In the Ptolemaic (Greek) model of the
Q73: Word Analysis. Examine the words and/or phrases