Oceanography

Decreasing ocean temperature causes the density of the water to ______.

• decrease

• increase

• stay the same

• fluctuate

 The density of ocean water is influenced by what two factors?

•  Salinity and temperature
• Water color and chlorophyll
•  Dissolved gases and dissolved solids
•  Dissolved carbon and trace elements

The temperature and salinity of the ocean change the most:

• Near the surface
•  Near the bottom
•  Near Antarctica
• Near the equator

T4 - As salinity  increases

• Density increases
• Density decreases

T4 - True or False Salinity increases as ocean depth increases.

• True
• False

The gradual increase in density as depth increases is the

• halocline

• pycnocline

• metacline

• thermocline

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

• chemical weathering of rocks

• evaporation of water from the ocean

• excretions from marine organisms

• melting icebergs and sea ice

At least 80% of the ocean water is included in the

• transition zone

• thermocline

• surface mixed zone

• deep zone

The three-layered structure of the open ocean does NOT exist

• in middle lattitudes

• in high lattitudes

• in low lattitudes

• at the equator

Which one can move against currents?

• Plankton

• Nekton

• Benthos