1. The flux that removes excess calcium from the ocean basins is ________. A) ev

Question

1. The flux that removes excess calcium from the ocean basins is ________. A) evaporation C) subduction
B) sedimentation of calcium carbonate D) reaction with sodium

2. What proportion of the total amount of carbon dioxide emitted into the atmosphere each year stays in the atmosphere?
A) approximately 25% C) approximately 75%
B) approximately 50% D) approximately 100%

3. Chemical analysis of ice cores demonstrates that as temperature increases, concentrations of atmospheric __________.
A) carbon dioxide and methane both decrease
B) carbon dioxide decreases while methane increases

C) carbon dioxide increases while methane decreases D) carbon dioxide and methane both increase

4. At the last glacial maximum, sea level was about ______ lower than today. A) 10 m B) 130 m C) 200 m D) 1000 m

Explanation / Answer

1) B) sedimentation of calcium carbonate

2)A) approximately 25%

3) D) carbon dioxide and methane both increase

4) B) 130 m

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