Which element would be surprisingly considered a trace element in the ocean despite its abundance in
the atmosphere?
a. Sodium
b. Calcium
c. Chloride
d. Nitrogen
ANS: D
Nitrogen is a trace element in the ocean despite its abundance in the atmosphere. Any element that is
less than 1 part per million is considered a trace element. Although trace elements are such small
quantities, they are often crucial to life processes. Information can be found in the section Seawater
Consists of Water and Dissolved Solids
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