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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 Video episode 8 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 Chapter 6: from the section The Ocean Is Stratified by Density Question 3 1 / 1 pts Which of the ocean's layers is least dense? Pycnocline Surface zone Deep zone Chapter 6: from the section The Ocean Is Stratified by Density 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 Chapter 6: from the section Water Has Unusual Thermal Characteristics 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 Chapter 6, from the section The Water Molecule Is Held Together by Chemical Bonds 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 Chapter 6: from the section Water Has Unusual Thermal Characteristics 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 Video, episode 7 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 Information can be found in the section Surface Water Moderates Global Temperature (chapter 6) Question 9 1 / 1 pts Where does all food production by photosynthetic marine organisms occur? Aphotic zone Mesopelagic zone Photic zone Benthic zone Chapter 6: from the section Light Does Not Travel Far through the Ocean 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 Chapter 6, from the section The Water Molecule Is Held Together by Chemical Bonds Question 11 1 / 1 pts Where is the thermocline generally absent? Local southern California temperate waters Tropical waters Polar waters Information can be found in the section The Ocean Is Stratified by Density (chapter 6) 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
Video episode 8
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
Chapter 6: from the section The Ocean Is Stratified by Density
1 / 1 pts
Which of the ocean's layers is least dense?
Pycnocline
Surface zone
Deep zone
Chapter 6: from the section The Ocean Is Stratified by Density
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
Chapter 6: from the section Water Has Unusual Thermal Characteristics
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
Chapter 6, from the section The Water Molecule Is Held Together by Chemical Bonds
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
Chapter 6: from the section Water Has Unusual Thermal Characteristics
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
Video, episode 7
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
Information can be found in the section Surface Water Moderates Global Temperature (chapter 6)
1 / 1 pts
Where does all food production by photosynthetic marine organisms occur?
Aphotic zone
Mesopelagic zone
Photic zone
Benthic zone
Chapter 6: from the section Light Does Not Travel Far through the Ocean
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
Chapter 6, from the section The Water Molecule Is Held Together by Chemical Bonds
1 / 1 pts
Where is the thermocline generally absent?
Local southern California temperate waters
Tropical waters
Polar waters
Information can be found in the section The Ocean Is Stratified by Density (chapter 6)
1 / 1 pts
Sound can travel great distances in the minimum-velocity (SOFAR) layer of the ocean.
True
False
Chapter 6: from the section Sound Travels Much Farther Than Light through the Ocean
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
Chapter 6: from the section Sound Travels Much Farther Than Light through the Ocean
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
Chapter 6: from the section The Ocean Is Stratified by Density
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
