Homework answers / question archive / Question 1 1 / 1 pts What is bioluminescence used for?   To indicate the density differences of various water masses    To measure salinity differences in seawater    Visual (optical) communication in the ocean   As a lure used by commercial fishermen   Question 2 1 / 1 pts Which of the water samples described below is the most dense?    Warm and less salty     Warm and salty     Cold and salty   Cold and less salty   Question 3 1 / 1 pts Which of the ocean's layers is least dense?    Pycnocline     Surface zone     Deep zone     Question 4 1 / 1 pts The amount of heat energy required to raise one gram of water by one degree (Celsius) is known as:      Sensible heat     Latent heat of fusion     Temperature     Heat capacity     Question 5 1 / 1 pts How do hydrogen bonds hold water molecules together?    Positive hydrogen atoms are attracted to negative oxygen atoms     Positive hydrogen atoms are attracted to other positive hydrogen atoms    Positive oxygen atoms are attracted to negative hydrogen atoms   Negative oxygen atoms are attracted to other negative oxygen atoms   Question 6 1 / 1 pts Why does ice float?   Water compresses as it freezes creating less space between water molecules     The freezing process breaks hydrogen bonds allowing some water molecules to leave the ice crystal structure      Water expands as it freezes creating more space between water molecules    Water captures air as it freezes creating pockets of gas within the ice structure    Question 7 1 / 1 pts In iron deficient regions, how might adding iron to the oceans reduce global warming?      Increasing photosynthetic production of carbon dioxide     Increasing the amount of photosynthetic plankton that use carbon dioxide     Increasing the amount of photosynthetic plankton use of oxygen   Increasing photosynthetic production of oxygen   Question 8 1 / 1 pts Why don't the polar oceans freeze solid and equatorial oceans boil away?                          The underlying mantle warms polar water and cools equatorial water     The thermal inertia of water is low in the poles and in equatorial regions     Currents in the atmosphere and ocean move huge amounts of heat from equatorial regions to the poles   The latent heat of fusion and vaporization balance the heat energy inputs and outputs   Question 9 1 / 1 pts Where does all food production by photosynthetic marine organisms occur?    Aphotic zone     Mesopelagic zone    Photic zone   Benthic zone   Question 10 1 / 1 pts Why do we say that water is a polar molecule?    It has an odd number of atoms     It has a positive end and a negative end     Its electrons can change their charge from time to time   It changes between the liquid and solid state easily   Question 11 1 / 1 pts Where is the thermocline generally absent?    Local southern California temperate waters     Tropical waters   Polar waters   Question 12 1 / 1 pts Sound can travel great distances in the minimum-velocity (SOFAR) layer of the ocean

Question 1 1 / 1 pts What is bioluminescence used for?   To indicate the density differences of various water masses    To measure salinity differences in seawater    Visual (optical) communication in the ocean   As a lure used by commercial fishermen   Question 2 1 / 1 pts Which of the water samples described below is the most dense?    Warm and less salty     Warm and salty     Cold and salty   Cold and less salty   Question 3 1 / 1 pts Which of the ocean's layers is least dense?    Pycnocline     Surface zone     Deep zone     Question 4 1 / 1 pts The amount of heat energy required to raise one gram of water by one degree (Celsius) is known as:      Sensible heat     Latent heat of fusion     Temperature     Heat capacity     Question 5 1 / 1 pts How do hydrogen bonds hold water molecules together?    Positive hydrogen atoms are attracted to negative oxygen atoms     Positive hydrogen atoms are attracted to other positive hydrogen atoms    Positive oxygen atoms are attracted to negative hydrogen atoms   Negative oxygen atoms are attracted to other negative oxygen atoms   Question 6 1 / 1 pts Why does ice float?   Water compresses as it freezes creating less space between water molecules     The freezing process breaks hydrogen bonds allowing some water molecules to leave the ice crystal structure      Water expands as it freezes creating more space between water molecules    Water captures air as it freezes creating pockets of gas within the ice structure    Question 7 1 / 1 pts In iron deficient regions, how might adding iron to the oceans reduce global warming?      Increasing photosynthetic production of carbon dioxide     Increasing the amount of photosynthetic plankton that use carbon dioxide     Increasing the amount of photosynthetic plankton use of oxygen   Increasing photosynthetic production of oxygen   Question 8 1 / 1 pts Why don't the polar oceans freeze solid and equatorial oceans boil away?                          The underlying mantle warms polar water and cools equatorial water     The thermal inertia of water is low in the poles and in equatorial regions     Currents in the atmosphere and ocean move huge amounts of heat from equatorial regions to the poles   The latent heat of fusion and vaporization balance the heat energy inputs and outputs   Question 9 1 / 1 pts Where does all food production by photosynthetic marine organisms occur?    Aphotic zone     Mesopelagic zone    Photic zone   Benthic zone   Question 10 1 / 1 pts Why do we say that water is a polar molecule?    It has an odd number of atoms     It has a positive end and a negative end     Its electrons can change their charge from time to time   It changes between the liquid and solid state easily   Question 11 1 / 1 pts Where is the thermocline generally absent?    Local southern California temperate waters     Tropical waters   Polar waters   Question 12 1 / 1 pts Sound can travel great distances in the minimum-velocity (SOFAR) layer of the ocean

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Question 1

1 / 1 pts

What is bioluminescence used for?  

To indicate the density differences of various water masses

  

To measure salinity differences in seawater

  

Visual (optical) communication in the ocean

 

As a lure used by commercial fishermen

 

Question 2

1 / 1 pts

Which of the water samples described below is the most dense?

  

Warm and less salty

   

Warm and salty

   

Cold and salty

 

Cold and less salty

 

Question 3

1 / 1 pts

Which of the ocean's layers is least dense?

  

Pycnocline

   

Surface zone

   

Deep zone

 

 

Question 4

1 / 1 pts

The amount of heat energy required to raise one gram of water by one degree (Celsius) is known as:

 

  

Sensible heat

   

Latent heat of fusion

   

Temperature

   

Heat capacity

 

 

Question 5

1 / 1 pts

How do hydrogen bonds hold water molecules together?

  

Positive hydrogen atoms are attracted to negative oxygen atoms

   

Positive hydrogen atoms are attracted to other positive hydrogen atoms

  

Positive oxygen atoms are attracted to negative hydrogen atoms

 

Negative oxygen atoms are attracted to other negative oxygen atoms

 

Question 6

1 / 1 pts

Why does ice float?  

Water compresses as it freezes creating less space between water molecules

   

The freezing process breaks hydrogen bonds allowing some water molecules to leave the ice crystal structure 

   

Water expands as it freezes creating more space between water molecules 

 

Water captures air as it freezes creating pockets of gas within the ice structure 

 

Question 7

1 / 1 pts

In iron deficient regions, how might adding iron to the oceans reduce global warming?
 

  

Increasing photosynthetic production of carbon dioxide

   

Increasing the amount of photosynthetic plankton that use carbon dioxide

   

Increasing the amount of photosynthetic plankton use of oxygen

 

Increasing photosynthetic production of oxygen

 

Question 8

1 / 1 pts

Why don't the polar oceans freeze solid and equatorial oceans boil away?

                     

  

The underlying mantle warms polar water and cools equatorial water

   

The thermal inertia of water is low in the poles and in equatorial regions

   

Currents in the atmosphere and ocean move huge amounts of heat from equatorial regions to the poles

 

The latent heat of fusion and vaporization balance the heat energy inputs and outputs

 

Question 9

1 / 1 pts

Where does all food production by photosynthetic marine organisms occur?

  

Aphotic zone

   

Mesopelagic zone

  

Photic zone

 

Benthic zone

 

Question 10

1 / 1 pts

Why do we say that water is a polar molecule?

  

It has an odd number of atoms

   

It has a positive end and a negative end

   

Its electrons can change their charge from time to time

 

It changes between the liquid and solid state easily

 

Question 11

1 / 1 pts

Where is the thermocline generally absent?

  

Local southern California temperate waters

   

Tropical waters

 

Polar waters

 

Question 12

1 / 1 pts

Sound can travel great distances in the minimum-velocity (SOFAR) layer of the ocean. 

  

True

   

False

 

 

Question 13

1 / 1 pts

What type of sonar projects pulses of high-frequency sound and then analyses the echo of the returning sound energy?

  

Passive sonar

   

Refractive sonar

   

Active sonar

   

Deep-zone sonar

 

 

Question 14

1 / 1 pts

Where would you find a thermocline?

  

Between the deep zone and the sea floor

   

Between the pycnocline and the halocline

   

Between the surface zone and the atmosphere

   

Between the surface zone and the deep zone

 

 

Question 15

0 / 1 pts

Why are temperature and salinity differences in the ocean so important?

  

They create layers, which prevent harmful bacteria from the surface to enter deeper water layers

   

Causes rising and sinking water, which create currents that ultimately affect climate

   

These differences create differences in pH, which is vital to the diversity of life in the ocean

   

They create currents that keep the density of the ocean mixed and homogeneous from surface to the sea floor