The only significant way oxygen (O2) enters the atmosphere is through
A) oxidation
B) neutralization
C) photosynthesis
D) respiration
Correct Answer:
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Q9: Respiration is the
A)breakdown of water and carbon
Q10: Select the true statement.
A)Nitrogen gas and oxygen
Q11: The average time that an atom of
Q12: The compartments of our planet are
A)hydrosphere, lithosphere,
Q13: The geosphere of our planet is composed
Q15: The phosphorus cycle differs from the others
Q16: Which cycle requires photosynthesis?
A)carbon cycle
B)nitrogen cycle
C)sulfur cycle
D)phosphorus
Q17: Which of the following produces useful nitrogen
Q18: Which of the following cycles does not
Q19: Why is nitrogen an element one would
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