Ocean salinity and density

Open Ended

What are some ways that the salinity of ocean water can increase? How about decrease?

Open Ended

How would an increase in salinity and a decrease in temperature effect the density of ocean water?

Multiple Choice

What is the total amount of salt in ocean water?

• 34.69 g

• 19.10 g

• 965.31 g

• 2.66 g

Multiple Choice

What are the main gases and solids found in seawater?

• CO2 and O2

• Na, Ca, Fe, Si

• H2O and Cl

• Mg, K, OH

Multiple Choice

What conditions would most likely cause a decrease in the salinity of ocean water?

• High rates of evaporation
• Freezing glaciers
• Extremely hot weather
• A river flowing into the sea

Multiple Choice

What tools do scientists use to measure the amount of ions in water?

• Thermometers

• pH meters

• Salinity sensors

• Spectrometers

Multiple Choice

Where did the Oceans get their salt?

• From rivers

• From volcanoes

• From the atmosphere

• From glaciers

Multiple Choice

What minerals are released during the chemical weathering of rocks?

• Ca²⁺, Na⁺, K⁺, Mg²⁺

• Fe²⁺, Al³⁺, Si⁴⁺, Cl⁻

• Na⁺, Cl⁻, K⁺, Ca²⁺

• Mg²⁺, H⁺, O²⁻, N³⁻

Multiple Choice

What is the significance of the constant salinity in oceans?

• It affects marine life

• It changes with seasons

• It is influenced by rivers

• It has no impact on climate

Multiple Select

What are the factors that influence variations in ocean salinity?

• Evaporation of seawater

• Precipitation of rain or snow

• Melting of ice

• River runoff

Multiple Choice

Which of the following factors contributes to lower salinity in oceans?

• Precipitation

• River runoff

• freezing of ice

• Groundwater flow to rivers

Multiple Choice

What happens to salinity as depth increases in the ocean?

• It decreases

• It remains constant

• It increases

• It fluctuates

Multiple Select

What are the three zones of salinity in the ocean?

• Surface Zone

• Halocline

• Deep Zone

• Thermocline

Multiple Choice

What is the salinity range for the Mediterranean Sea?

• 35.5-36

• 36.5-37.5

• 37.5-38.5

• 32-34

Multiple Choice

What does the diagram illustrate about salinity levels in different regions of the world?

• It shows that salinity is uniform across the globe.

• It indicates areas of low and high salinity.

• It demonstrates the salinity levels only in the Pacific Ocean.

• It compares salinity levels in freshwater and saltwater.

Open Ended

What happens when water at different depths has different densities?

Multiple Choice

What is the role of calcium in marine life?

• To make shells of mollusks

• To provide energy

• To aid in digestion

• To regulate temperature

Multiple Choice

How in general does ocean acidification affect corals or other organisms with the calcium carbonate shells?

• makes the crustaceans flee

• kills fish on the coral reefs

• causing organisms and skeletons made from calcium carbonate to dissolve.

• none

Multiple Choice

An example of a marine organism that needs calcium carbonate 

• a clam

• a shark

• an octopus

• a whale

Multiple Choice

What is osmoregulation?

• The ability of aquatic organisms to maintain a proper water balance within their bodies

• The movement of water molecules through a semipermeable membrane

• The process of photosynthesis in plants

• The absorption of nutrients in the intestines

Multiple Choice

What happens to a sea star when placed in fresh water?

• It thrives and grows

• It dies due to osmotic pressure

• It adapts to the environment

• It becomes a freshwater species

Multiple Choice

What is the salinity inside the salmon's body?

• 0 ppt

• 18 ppt

• 35 ppt

• 50 ppt

Multiple Choice

How does temperature and salinity affect deep currents?

• As temperature decreases and salinity increases the water becomes more dense

• As temperature decreases and salinity increases the water becomes less dense

• As temperature increases and salinity decreases the water becomes more dense

• As temperature increases and salinity increases the water becomes less dense