Chapter 15 Test

Front

The proportion of dissolved substances in seawater is usually expressed in

Back

parts per thousand.

Front

Which of the following is a source of dissolved substances in the ocean?

• chemical weathering of rocks
• evaporation of water from the seas and ocean
• excretions from marine organisms
• melting icebergs and sea ice

Back

chemical weathering of rocks

Front

How do elements such as chlorine, bromine, sulfur, and boron get into the ocean?

Back

volcanic eruptions

Front

Which process does NOT decrease the salinity of seawater? Options: runoff, solar radiation, evaporation, weathering

Back

weathering

Front

Differing amounts of solar radiation across Earth’s latitude affect the ocean’s

Back

temperature at the surface.

Front

What happens when the ocean’s salinity increases?

Back

Density increases.

Front

What is the most important factor affecting seawater density?

Back

temperature

Front

At least 80 percent of ocean water is included in the

Back

deep zone.

Front

The three-layered structure of the open ocean does NOT exist in which location?

Back

in high latitudes.

Front

Marine organisms can be classified according to

Back

where they live.