Exam 14: Ocean Water and Ocean Life

At high latitudes the thermocline is ________.

Halite (sodium chloride)is the most abundant salt found in seawater.

The dissolved materials in seawater are thought to originate from chemical weathering of rocks on the continents and also from ________.

________ include all organisms that drift with ocean currents.

Seawater has become more acidic since the industrial revolution and this is commonly attributed to ________.

The density of seawater is controlled by temperature and salinity.

Fish most commonly live ________.

Clams,sponges,and other bottom-dwelling animals are called benthos organisms.

Only about 2 % of the light energy absorbed by algae is ultimately synthesized into food and made available to herbivores.

Clams,sponges,and crabs are all examples of ________ organisms.

The most abundant salt in seawater is ________.

In the food chain,each feeding stage is called a ________ level.

Animals capable of moving independent of the ocean currents,by swimming or other means of propulsion,are called ________.

The open ocean,regardless of depth,where animals swim or float freely is called the abyssal zone.

plankton nekton neritic benthos