Physical Properties of Sea water

Physical Properties of Sea water

Ocean Water Density

• density varies with salinity and temperature

• Cold water is denser than warm water and the same is true about salty water being more dense than freshwater

• Because of these factors, seawater naturally stratifies

Ocean water layers

• there are three layers in the ocean, the mixed layer, the thermocline and the deep zone

• mixed layer the most biologically productive as it is where the sun enters into the ocean

• thermocline separates the mixed layer from the deep zone

• Below the thermocline is the deep zone which is usually the coldest and deepest layer

Multiple Choice

True or False Salinity increases as ocean depth increases.

• True
• False

Multiple Choice

Ocean depth  increases & Salinity  increases then

• Temperature decreases because cold water is more dense and sinks
• Temperature increases because cold water is more dense and sinks

Multiple Choice

As salinity increases

• Density increases

• Density decreases

Multiple Choice

What is the boiling point of water ?

• 212 C

• 100 C

• 32 C

• 0 C

Multiple Choice

Put the liquids in order from most dense to least dense?

• 4, 3, 2, 1
• 1, 2, 3, 4
• 3, 4, 2, 1, 
• 4, 3, 1, 2

Light in the Ocean

• Light typically is only found in 2% of the ocean's waters. The region where light is found is called the photic zone

• the photic zone is usually no deeper than 600 meters in the clearest of waters

• Water tends to absorb wavelengths of light starting at red and going all the water to violet at various depths

• if you are a scuba diver diving at a depth below the absorption level of red wavelengths, red items will no longer appear red

Light in the Ocean

• Below the photic zone is the aphotic zone. The aphotic zone is void of light

Multiple Choice

Would you find photosynthetic organisms in the aphotic zone?

• Yes

• No

Multiple Choice

What color of the rainbow (ROYGBIV) is first absorbed by the ocean?

• Red

• Orange

• Yellow

• Green

• Blue

Open Ended

What is an example of an organism you might find in the photic zone?

Open Ended

What is an example of an organism you might find in the aphotic zone?

Multiple Choice

The aphotic zone is

• the ocean's dark lower layer where photosynthesis cannot occur
• the sunlit upper layer of the ocean where photosynthesis occurs
• on the bottom of lakes, streams, and oceans.
• where benthos are found

Multiple Choice

Phytoplankton are abundant in this ecosystem, because they are buoyant and float in the upper part of the water.

• Intertidal zone (high tide)

• Ocean (aphotic zone)

• Ocean (photic zone)

• Intertidal zone (low tide)

Multiple Choice

The zone in the oceans layers with the warmest temperatures that is warmed by sunlight and most life exist there?

• Photic Zone

• Depth

• Water temperature

• Mid- Ocean Ridge

Multiple Choice

MOST sealife lives in the:

• Photic zone

• Twilight zone

• Midnight zone

• Deep zone

Multiple Choice

Which ocean zone allows plants to grow??

• midnight zone

• photic zone

• twilight zone

• intertidal zone

Sound in the Ocean

• Density increases the speed of sound

• As temperaures increase, the speed of sound increases

Multiple Choice

All the following affect the speed of sound underwater except 

• salinity
• pressure
• light
• temperature

Poll

How do you feel about today's lesson?

• I've got it!

• I still have questions.

• I'm lost at sea.