Water Pressure, Depth, & Sound

How many feet down in depth before you get 1 atmospheric pressure (the weight of the atmosphere)?

• 20ft

• 33ft

• 65ft

• 100ft

What is the average salt content of the ocean?

• 10ppt

• 15ppt

• 27ppt

• 35ppt

Which of these constituents do NOT makeup the salinity of the ocean?

• Fluorine

• Sodium

• Chloride

• Magnesium

Refractometer is used to measure . . .

• density of water

• temperature of water

• clarity of water

• salinity of water

75% of the ocean is in this range of temperature

• 30 - 43 degrees

• 70 - 83 degrees

• 50 - 62 degrees

• 43 - 55 degrees

The pycnocline is the layer where . . .

• density decreases rapidly

• salinity decreases rapidly

• density increases rapidly

• salinity increases rapidly

How fast does sound travel through water?

• 750m per second

• 1200m per second

• 1450m per second

• 2000m per second

What is the last color to be absorbed by water when light is passing through the ocean?

• blue

• red

• yellow

• green

What is unique about sound trapped in the SOFAR layer?

• sound can travel far distances because it is stuck in a channel.

• sound cannot pass through this layer of the ocean

• sound loses speed when it hits this layer and dissipates

• sound speeds up and refracts back to the object creating the sound

How far does sunlight travel through the ocean?

• 50ft

• 100ft

• 250ft

• 330ft