AICE Quiz 1.3 - Density and Pressure

The thermocline is

• an ocean layer where rapid change in temperature occurs
• an ocean layer where rapid change in salinity occurs
• an ocean layer where rapid change in density occurs

For these thermoclines, what unit is missing from the x-axis?

• temperature - in Celsius
• temperature - in Fahrenheit
• dissolved oxygen - in mg/L
• salinity - in ppt

Which of the following is incorrect?

• the density of water is 1.0 g/ml
• the density of ice is 0.9 g/ml
• the density of seawater is 1.03 g/ml
• all of these are correct

What is incorrect about this graph?

• It is impossible to tell what the graph is showing without a title
• The scale of the y-axis is too large of a range, making it difficult to see any differences between the data points
• The unit for density is incorrect, density can only be represent in cubic centimeters

Which thermocline represents a polar ocean?

• thermocline A
• thermocline B
• thermocline C
• thermocline D

Which is more dense?

• ice
• seawater

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Which is more dense?

• saltwater
• freshwater

Which of the following is shown here?

• halocline
• thermocline
• pycnocline

What can you conclude about the data shown on this graph?

• cold water is more dense
• warm water is more dense