What is the source of most of the dissolved materials found in the ocean?
a. Outgassing
b. Convection currents
c. Dissolving and weathering of crustal rocks
d. Biological activities
ANS: C
Although there are multiple sources of the dissolved materials in the ocean, much of the material
comes from the weathering of surface rocks from rain and waves. The composition of the ocean is
different from rivers because there is the addition of excess volatiles coming from the upper mantle.
Information can be found in the section Seawater Consists of Water and Dissolved Solids.
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A) is an oval projection B) cannot be used with interrupted projections C) is the kind of projection used in most of your textbook's maps D) does not have central meridians and parallels E) is not a type of projection explained in your textbook