Unit 6 practice Test

Why is there high salinity in Ocean water near the Equator?

• precipitation
• High levels of evaporation

• volcanoes
• deposition

Deep ocean currents & surface ocean currents are caused by-

• underwater earthquakes
• human influence
• sun moon and Earth interaction
• density differences caused by changes in temperature & salinity

Upwelling is most likely to occur in what area?

• in a deep sea trench
• in a shallow gulf
• along a coastline
• in open ocean

What causes oceans to become less salty?

• Increased fresh water runoff and ice melting

• Formation of Sea ice

• Nutrient pollution from farms

• Toxic oil spills

What human activity releases Co2 into the atmosphere and is the main cause of ocean acidification

• pollution from ships
• Burning fossil Fuels

• dumping of waste from cities into the ocean
• Agricultural runoff

Marine organisms make their shells from calcium and

• chloride
• carbonate
• Carbon Dioxide (Co2)

• ocean PH

This graph demonstrates that

• Co2 in the ocean increase at the same rate as Co2 in the atmosphere, which decrease ocean PH levels

• That pH of the ocean increases as the atmospheric CO₂ increases

• That there is no correlation between pH of the ocean and atmospheric CO₂

• Ocean PH increases as ocean Co2 increases

Coral & shellfish are sensitive to ocean temperatures and the amount of available carbonate. What can you predict will happen if ocean temperatures continue to rise and levels of carbonate continue to fall?

• Bleaching of coral reefs & reduction of shellfish populations

• Larger varieties of coral will form

• Coral reefs will form in deeper parts of the ocean

• Shellfish will move to other parts of the ocean

El Nino brings unexpected weather conditions to different regions of the United States. It will cause dry weather in the south when its normally wet, and lots of rain in the desert when normally dry. What is the best way to describe this phenomenon?

• Melting of polar ice caps

• Varied atmospheric (weather) conditions

• Summers get longer

• Increase volcanic erruptions

Which answer correctly labels each of the seafloor features seen in this image?

• 1. 1. Continental shelf

  2. 2. Continental Slope

  3. 3. Continental Rise

  4. 4. Abyssal Plain

• 1. 1. Continental shelf

  2. 2. Continental rise

  3. 3. Continental Slope

  4. 4. Abyssal Plain

• 1. 1. Abyssal Plain

  2. 2. Continental Slope

  3. 3. Continental Rise

  4. 4. Continental Shelf

• 1. 1. Continental slope

  2. 2. Abyssal Plain

  3. 3. Continental Shelf

  4. 4. Seafloor spreading