It Is Now Virtually Certain That the dominant Cause of Recent

question 84

Multiple Choice

It is now virtually certain that the dominant cause of recent ice ages is

• A)the blocking of sunlight by volcanic eruptions.
• B)variations in Earth-Sun orbital relationships.
• C)changes in radiation output from the Sun.
• D)the blocking of sunlight by galactic dust.
• E)changing ocean salinity and rates of evaporation.

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