Properties and Composition of Seawater Quiz

Sodium is the most abundant element in seawater.

The approximate salinity of seawater is 3.5%.

The average temperature of seawater is 15°C.

Salinity primarily determines the density of seawater.

Reverse osmosis removes salt from seawater to make it drinkable.

The average pH of seawater is 8.0.

Oxygen is the most abundant gas in seawater due to photosynthesis by marine plants.

The bathypelagic layer of the ocean contains the densest seawater.

Photosynthesis by marine plants is the primary source of dissolved oxygen in seawater.

The Arctic Ocean contains the highest salinity.

Carbon dioxide is the main dissolved gas in seawater that influences its acidity.

The scattering of light by water molecules is responsible for the blue color of the ocean.

The hadopelagic layer of the ocean is characterized by very low temperatures, high pressure, and complete darkness.

Approximately 80% of dissolved oxygen is present in seawater compared to air.

Carbon dioxide contributes significantly to the greenhouse effect in the ocean.