Unit 6: Oceanography Review

Ocean salinity is usually expressed in ____.

• charts

• parts per thousand

• parts per billion

• chemical formulas

One thousand grams of seawater would consist of how many grams of dissolved substances?

• 35

• 65

• 635

• 965

What is density?

• mass-per-unit volume

• mass-per-unit area

• weight-per-unit mass

• weight-per-unit volume

In addition to salinity, what factor affects the density of seawater?

• depth

• temperature

• latitude

• salt content

Which of the following is NOT a category of marine organisms?

• plankton

• aphotic

• nekton

• benthos

What term describes organisms that live on or in the ocean floor?

• plankton

• nekton

• pelagic

• benthos

Marine organisms are classified according to how they ____.

• live

• eat

• move

• live and move

Which of the following is a type of nekton?

• shark

• bacteria

• zooplankton

• sea star

How do plankton differ from nekton?

• Plankton are strong swimmers

• Plankton are carnivores

• Plankton are free-floating

• Plankton live on the bottom of the ocean

What is true about the deepest parts of the ocean floor?

• animals live in constant darkness

• algae thrive

• temperatures are moderate to high

• nekton are more common than benthos